CudaMail Solutions

 Friday, May 30, 2008
Friday, May 30, 2008 5:54:15 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | Spam | Threats )
Here's what's went on this week in the blogosphere in the anti spam world:


Backscatter

Use a service or server based anti spam system. Such systems employ measures that block spam and are hardened to large quantities of spam and will provide some protection from backscatter in and of themselves, however the spam ...


How much longer will anti-spam captchas be useful?

Luis von Ahn, an inventor of the anti-spam tool known as "captchas," talks with Jon Gordon about how much longer the squiggly line challenge-response tools will be useful.


TypePad launches new anti-spam tool for bloggers

TypePad AntiSpam is the product of the antispam technology Six Apart has been using in their TypePad hosted blogs since May 2007. Now the service, which is in beta, is available to anyone, open source, and free -- regardless of how ...


MySpace wins $230 million anti-spam judgment

Just saw this over at namepros, although I don't use myspace but I like to think that spammers (not only the ones spamming myspace) will think twice before doing spamming again Excite News - MySpace wins $230 million anti-spam judgment.


Social Networking Sites Also Popular With Spammers

Popular networking sites have become one of the latest targets in recent spam attacks. Cloudmark, an anti-spam enterprise, revealed that social networking sites have seen a huge rise in spam in the 6 months to March 2008. ...


Enjoy!

- Shaun

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 Wednesday, May 21, 2008
Wednesday, May 21, 2008 9:47:40 AM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | Memorial Day | Spam | Threats )
With the down turn in the US economy more people are turning to the web for the best deal so expect vendors to be even more aggressive in their approach to getting eyeballs on ads and this includes sending more e-mail marketing as this is the least cost advertising venue.

The spammers have been using e-mail for years now because it works and the big marketers have joined in as a scan of some of the recent subject lines processed by CudaMail shows.

Some of these are spam and some are just marketing messages:


Alarm systems.
"5 Horrible Home-Invasion Statistics."
"Secure your home today"

Pharma
"Live Life to the fullest"
"May 21st - Ready to Process Reorder"
"Cleanse your digestive system and feel great."
"Side effects include: Increased libido, decreased cellulite, and ..."

Office Supplies
"Discount printer ink and toner plus extra 10% coupon"

Social Networking
"Someone is looking for you. Find out who."

Septic Tank Insurance
"Has your Septic Tank ever backed up on you?"

Hardware and Tools
'True Value: Weekly Merchandising Newsletter - 5.20.08"

Vacations
"World Series of Poker* Invitation in Vegas for You"

Men's Clothing
"20% Off + $4.95 Flat Rate Shipping"

Women's Clothing and Swimwear
"Memorial day event - 50 items at 50% off!"

Satellite TV
"Over 40 Digital Quality channels for $19.99/mo. Get more with DISH Network"

Wedding Decorations
"Wedding Accessories on Sale"

Business Cards
"MAY MADNESS LAST DAY!!!!!"

Big Fans
"Industrial Cooling...$99"

So a warning to everyone that from our Operations Center here at CudaMail we see the volume of e-mail marketing, both legitimate and unwanted spam, is being turned up to 11 as we get closer to the long weekend in the U.S.

- Shaun

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 Tuesday, May 20, 2008
Tuesday, May 20, 2008 9:11:29 AM (Mountain Daylight Time, UTC-06:00) ( Natural Disasters | Phishing Scams )
Fires and floods and earthquakes, oh my...

Great reminder from US Cert on protecting yourself from the opportunists that prey on the feelings and emotions of all when a natural disaster strikes. At times when your heart strings are being pulled on it is almost as if the brain get's switched off and this provides an opening for the scammers to strike and they will.

If you want to help out in a situation like this then go through the official channels and not allow yourself to be solicited via a message delivered in an e-mail even if it comes from one of your trusted friends or family.

- Shaun

> From the US Cert (Computer Emergency Readiness Team) Natural Disasters and Phishing Scams

Original release date: May 19, 2008 at 4:30 pm
Last revised: May 19, 2008 at 4:30 pm

In the past, US-CERT has received reports of an increased number of phishing scams that take advantage of natural disasters. Due to recent natural disasters, US-CERT would like to remind users to remain cautious when receiving unsolicited email that could be a potential phishing scam.

Phishing scams may appear as requests for donations from a charitable organizations asking users to click on a link that will take them to a fraudulent website that appears to be a legitimate charity. The users are then asked to provide personal information that can further expose them to future compromises.

Users are encouraged to take the following measures to protect themselves from this type of phishing scam:
  • Do not follow unsolicited web links received in email messages.
  • Review the Federal Trade Commission's Charity Checklist.
  • Verify the legitimacy of the email by contacting the organization directly through a trusted contact number. Trusted contact information can be found on the Better Business Bureau National Charity Report Index.

For additional information regarding phishing, US-CERT recommends reading the following documents:
  • Recognizing and Avoiding Email Scams (PDF)
  • Avoiding Social Engineering and Phishing Attacks

Relevant Url(s):

http://www.us-cert.gov/cas/tips/ST04-014.html

http://www.us-cert.gov/reading_room/emailscams_0905.pdf

http://www.ftc.gov/bcp/edu/pubs/consumer/telemarketing/tel01.shtm

http://charityreports.bbb.org/public/All.aspx?bureauID=9999

====

This entry is available at:

http://www.us-cert.gov/current/index.html#natural_disasters_and_phishing_scams

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 Wednesday, May 07, 2008
Wednesday, May 07, 2008 11:44:12 AM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | Identity Theft )

A funny but O so true write-up from SANS (www.sans.org) on what NOT to do online.

1. Practice Unsafe Surfing. When you purchase a new computer, go online without activating the firewall, or purchasing protective software.

Further expose yourself digitally by sharing a wireless connection with the entire neighborhood. Without digital encryption, you can share the contents of your hard drive with anyone on the street. For maximum risk, do some online banking on a public computer -- like the one at the library or a public cafe. Bonus points are added if your Social Security number is your user ID for any transactions.

What you should really do:
  • Use a hardware firewall at work and at home along with good AV software that is kept up to date.
  • While the desire to go 'Wireless' is high and the products make is so easy take the time to set it up properly or call in an expert to set it up for you.
  • Never do more than just check news stories on some basic searching when on an unknown and thus un-trusted computer be it at the library or even over at your friends house.

2. Skimp on anti-virus and anti-spyware protection. Courting disaster online is easy. Invite malicious code to attack your computer simply by doing nothing. Antivirus programs can be pricey, and the maintenance of constantly downloading updates is time-consuming. Combine that with the security updates from Microsoft or Apple and it's enough to seriously annoy anyone.

What you should really do:

Install a good Anti-Virus solution, most like F-Secure, come in a full protection suite and could be included free with your internet connection (Shaw includes F-Secure for example) Turn on automatic updates in Windows and if your programs can be set to do the same do so. Once a month manually check to ensure your programs are up to date with something like the online F-Secure Health Check or the Secunia Software Inspector. It wouldn't hurt to visit both Windows Update and Office Update while your at it.

3. Passwords are a pain! Make life easy for yourself by using the same password for EVERYTHING, and make it something easy to remember, like your first name or 'password'. Just in case, make sure you write it down on a yellow sticky and put it somewhere easy to see.

And don't forget to have your browser set to 'remember password' to make life easy for you - and the cyber thief.

What you should really do:
  • Use the idea of a password phrase to remember hard to guess passwords. A favorite phrase or poem can become the backbone of a secure password policy.
  • For Example the phrase 'The quick brown fox jumped over the lazy dog' can be used to easily remember a password of 'tqbfjotld'.
  • Make your password harder to guess by throwing in Capitalization, numbers and special characters.
    • If you want to keep things simple then come up with at least three or four secure passwords.
    • The first would be used only for online banking. The second would be used for your e-mail. The third would be used anywhere you have to register to use a site. The fourth could be used for questionable sites that require you to register.

4. Peek at junk email and open attachments from unknown sources. Open attachments from strangers, secret crushes, long-lost friends saying "what's up," or strangers hawking cheap drugs -- you'll never know unless you peek at that email. One of the many fun things that can happen when you open an attachment containing malicious code is infecting your computer with a Trojan horse or virus, which can easily lead to identity theft.

What you should really do:

Use a service like CudaMail to filter out all these unwanted messages. They are either marketing messages or worse, spammers trying to add your computer to their botnet. Stay away from these messages no matter how 'interesting' the spammers make them.

5. Stuff your wallet with juicy identifying tidbits. Wallets and purses are more than just handy cash-carrying devices. They often have credit cards, identification, insurance information and even Social Security cards. Obviously, more is better if you'd like to become the prey of fraudsters.

Losing or misplacing a wallet or purse can cause more problems than just the hassle of replacing all those cards and buying a new bag. Armed with your date of birth, Social Security number and mailing address, there's no limit to the damage thieves could cause.

What you should really do:
  • Keep only what you need in your wallet or purse.
  • The rest of the information should be in a safety deposit box where you can get it if you need it but the rest of the time it is locked away.
  • Check on the personal information the credit bureaus have on you to make sure it is accurate and that someone hasn't signed up for a credit card or something else in your name but using a different address.

6. Make your checks payable to criminals. If you're like most people, you wouldn't post your checking account information on your front door, though you should if you'd like to be a victim of fraud. Similarly, checks reflecting the same information can be dropped casually into unsecured mailboxes. Statistically the chances of your mailbox being targeted by criminal elements are low, but not that low. According to the 2008 Identity Fraud Survey Report from Javelin Strategy and Research, almost 1 in 10 victims of identity theft who can pinpoint the scene of the crime say that it happened at the mailbox.

7. Opt out? Opt in! While you're mailing checks from the unlocked mailbox, go ahead and get credit card companies to send you all the pre-approved offers that the postman can cram into the box. Similarly, don't get credit card statements online; leave them on the side of the road so that they're more convenient for fraudsters who lack the technical knowledge or follow-through to launch complicated hacking schemes.

What you should really do:

Don't use the mailbox by your front door as an outbox just because it is convenient. Take your bills to the bank to pay or drop them off at a real post office. Anything you do get that has your identifying information on it like a pre-filled out credit application should go through a good cross cut paper shredder before leaving your place.

8. Nothing is too good to be true. Everyone wants to feel special and maybe more importantly, filthy rich. When reading an emailed proposition from an African business tycoon, an imperiled prince or downtrodden heiress offering millions of dollars in exchange for some small measure of assistance, it's difficult not to wish it were true. Falling for the story will undoubtedly lead to unpleasantness.

What you should really do:

Don't let your greed get the better of you. While the 'I have umpteen million dollars that I'm trying to sneak out of the country' e-mail's are getting old hat people are still falling for them. What is more insidious is the 'work at home as an agent' e-mail's that make it sound so easy. All you have to do is deposit a check or two each week into your personal bank account and wire transfer the funds to 'the company'. You either end up out the entire amount when the check is returned NSF or you are working for organized crime and are a money launderer.

The internet is a wonder and scary place at the same time. Be educated and play safe.

- Shaun
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 Monday, April 28, 2008
Monday, April 28, 2008 1:51:12 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | False Spam | Outlook Plug-In | Spam Filtering Service )
Mark - as the handler on duty at the Internet Storm Center - was nice enough to not only read all his spam for the week (about 2500 messages) but he also put together a nice chart showing what type of spam he was getting and from where:

Description

Email Origin

 

Greeting card

Germany

 

URL Link to exe.  28/33 AV products detected the file, three days ago it was 4.

Viagra/Cailis Mesages

Texas
Latvia
Paris
Russia
Chilli

Mount Laurel (US)
US
Italy
Israel

Links to Canadian Pharmacy web site.

Viagra/Cailis Meds

France

 

Web Site Canadian Healthcare

Movie downloads
(in Chinese)

Argentina

 

Nothing no links and nothing nasty, maybe a trial run.

Herbal remedies

USA
Germany

Sweden

Oman
Lithuania

Brazil

 

Products to enlarge body parts.

The message contained a URL to one of three sites hosted in the same address range.

The registrar owns 695 other domains, received 50 of them.

Lottery*

UK
Canada

Greece

 

So far this week I have won  about $500,000,000, not bad for not entering any lotteries.   The majority were sent from UK machines, machines at one particular facility.

Click Fraud

Spain
Bolivia

Poland

 

The links in the message are ad click redirects.

Paypal

US

France

 

The usual phishing exercise aimed at extracting account information.

I am Lonely Tonight

Turkey

 

The usual I’m lonely tonight emails.  If you respond it goes into how she wants to travel and can’t you help her out.  

Fake Goods

Bombay
Russia

Bahrain

Greece

Italy

Turkey
Slovak Republic

Thailand

Fake goods, watches, bags, etc. 

Business Proposal (419 messages)

US
Germany
Los Angeles

United Arab

Emirates

The Netherlands
Japan

Transfer money and get a percentage.

Work offers

Belgium

 

Work for a few hours per week and make thousands,  most of these linked to professional looking sites.   Typically they are recruiting for mules.

Threats

Turkey

Russia

There have been a few variants of these doing the rounds.


> Source: http://isc.sans.org/diary.html?storyid=4343

This is a lot of work that Mark has gone through but it does highlight the value of good metrics or ways of gauging how effective an anti-spam system is.

Here at the CudaMail support desk we occasionally get a client who at first is very upset that they got 5 spam messages in their inbox this morning and can't we do something about it? They are usually very thankful when we provide them with a report similar to the one below for their domain showing that tens of thousands of messages have already been blocked for them and these 5 messages are the start of a new campaign that they were lucky enough to get the first few messages from and now that they have provided us with some samples to work with we can stop this campaign in it's tracks too.

Sample CudaMail Spam Quarantine Summary



> Click CudaMail_Summary_for_Domain.pdf (12.76 KB) for to download the PDF sample

This also highlights the different perceptions we have as anti-spam specialists and the typical end-user or client. From our perspective we are fighting the good fight and our efforts are winning the war on spam. We block millions of messages a day and allow only a few 10's of thousands to be delivered to the client. Typical statistics are that on average 97 out of every 100 messages are spam and this is with a very low false positive rate (false positive = marking a wanted message as spam).

What is The Customer's Perspective On The Same Volume of Messages?

They are going about their important work without being bothered by those 97 out of 100 messages that are spam so when a few messages slip through to them all of a sudden they are being "flooded" with spam. Same numbers but a very different perspective on the issue.

What Can You - the CudaMail End-User - Do to Help Out?

1. Keep us in the loop. "One person's spam is another person's ham" as the saying goes so we don't know what you did or did not sign up for online. We maintain a number of spam traps and are always looking for new spam messages but may not be first in line when a spammer fires up his money making spam bot and sends out the latest surge. So if you are the lucky one to be fist on the spammers list and get a spam sample there are two very good ways to provide this feedback to CudaMail support.

2. Install and use the Outlook plug-in. For those of you who use Microsoft Office with the full Outlook e-mail client the Plug-in is the easiest way to send spam samples back to CudaMail support and we have blogged about this before. There are plug-ins available now for other e-mail clients (Thunderbird 2.x and Lotus Notes 6.5, 7 and 8) but these are under going beta testing right now.

You can read me Blog post about it by going here:


3. Debug-ID. For those who don't run Outlook or don't want to run a beta plug-in you can simply forward just the Debug-ID of the unwanted messages to the support@CudaMail.com address.

A quick 'How to display full headers in client x' can be found at the following URL:
While support only needs the one line with the X-ASG-Debug-ID: number on it go ahead and forward all the information in the full headers on to us. What you do not want to do is forward the spam message body along with the full headers. What happens more often than not is that the CudaMail system will take your spam sample re-processes it and block it before it gets to support. We don't know that you were trying to send us this sample and can't do any thing about it because we didn't get it in the first place. Now typically we don't respond to every message providing a spam sample but we do review each and every one of them and make sure that he system will block them in the future.

With the above two thoughts in mind - perspective and feedback - what do you - the CudaMail client - want to see from the CudaMail system? Do you want to be sent reports on a regular basis (Daily, Weekly or Monthly) or will this just add to your information overload?

We look forward to hearing from your either in the comments below or direct to support@CudaMail.com.

- Shaun

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 Friday, April 25, 2008
Friday, April 25, 2008 3:47:58 PM (Mountain Daylight Time, UTC-06:00) ( Barracuda Networks | Fortinet | Secure Computing | Spam Filtering Service )
Spammers are continuing to use the oldest trick in the book - social engineering - to try to get you to be part of their plan. The US CERT (Computer Emergency Readiness Team) has released a number of advisories over the last few weeks on recent Spammer tricks of impersonating someone trusted like the tax department or a trusted news source to get you to click on a one of their web links.

Here are some recent samples:

IRS Rebate Phishing Scam
Federal Subpoena Spear-Phishing Attack
Radiation Leak - from a trusted news source
The text included with the links the Spammers send may make your pulse race (I can get my Tax rebate now!) and thus they try to get the emotional part of you to take control of your mouse before the logical part of your brain (This sounds fishy - better be safe and delete this message or call them direct to confirm) kicks in.

Guess what? - By clicking on the link you played right into the Spammer's plan and you either filled in a form (Phishing) and gave them information they can use to steal your identity or money or your computer got infected and is now playing it's part in sending out Spam.

How do you keep yourself safe while on the Internet?

Install and use a good anti-virus / anti-malware product and keep it up to date.

Take the time - once in a month at least - to do a full update for security patches and then do a full anti-virus / anti-malware scan of your computer.

Use some reputable online scans to double check on your Anti-Virus.

F-Secure Health Check Online scanner
  • www.f-secure.com/healthcheck/
Panda Active Scan
  • www.pandasecurity.com/canada-eng/homeusers/solutions/activescan/default.htm?track=80383
Kaspersky

Secunia's Online Scanner (checks to confirm your software is up-to-date)
(Warning - These companies use these online services to try and sell you on their products - you may have to provide an e-mail address to start one or more of these services so you may get marketing related messages after using these services)

At work you will want to use a higher-end firewall (such as a firewall from Fortinet or Secure Computing) or a dedicated web filter appliance (from Barracuda Networks) with a second layer of anti-virus / anti-malware / web content filtering between your computers and the Internet.

Spammers are the problem but we have to do our best to be part of the solution!

- Shaun
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 Friday, April 18, 2008
Friday, April 18, 2008 9:06:46 AM (Mountain Daylight Time, UTC-06:00) ( Black Market | Illicit Trade | National Geographic | Sophos | Spam Filtering Service | Threats )
New figures suggest that 92.3 percent of all email sent globally during the first three months of 2008 was Spam1 and a second report indicates that the top botnets, if they worked together, are capable of sending over 100 billion Spam emails per day2.

The data from Sophos also indicated that 23,300 new Spam-related web pages were created every day during the period, or one about every three seconds.

Each and every one of these 2.1 Million URL's has to be discovered and added to the 'Intent' or URL database to be able to block them all, and you wonder why a few slip through the cracks?

Building a botnet first and then building 2.1 million web pages is a lot of effort to go through to send Spam touting the 'generic blue pill' or the latest 'real genuine copy' of the latest trendy fashion item be it a 'Designer Shoes Collection from Gucci Ugg Prada Chanel Dsquared' or other.

So Why Do Spammers Go To So Much Effort?

A recent National Geographic special called Illicit: The Dark Trade revealed the impact that all of these "knock-off" drugs, clothing, and accessories is having on the world (definitely worth watching). I didn't realize that the trade in counterfeit goods is a 600 Billion Dollar (USD) a year - yes that's a B, Billion - industry3 and a lot of it is done by international crime rings.

If they get caught for a counterfeit purse or shoe the sentence they get is a lot lighter than if they were trying to sell illegal drugs but it is the same people that do both and for the same reasons - to take advantage of you and your desire for a deal. The special also showed that counterfeit goods are more than just the 'real fake watches' as everything from toothpaste, mouthwash, generic drugs, automotive and airplane parts are being counterfeited as well. You think that 'blue pill' you bought online for such a deal was the real thing? Think again - it probably contained Borax bleach, chalk and paint - if you're lucky!

It has often been said that if people just stopped buying from the Spammers then there would be no financial incentive for them to send their Spam emails.

Let's try this statement on for size - if you purchase something promoted by a Spam message that sounds too good to be true - it is likely a counterfeit item and you are directly contributing to organized crime and terrorism.

Now go out there and play safe.

- Shaun

1 www.itnews.com.au/News/74071,new-spam-site-found-every-three-seconds.aspx

2 www.secureworks.com/research/threats/topbotnets/?threat=topbotnets

3 www.iacc.org/counterfeiting/counterfeiting.php

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 Wednesday, April 16, 2008
Wednesday, April 16, 2008 9:34:07 AM (Mountain Daylight Time, UTC-06:00) ( Barracuda Networks | Barracuda Website Firewall | SQL Injection )
According to John Leyden (from "The Register") in his article "Security gumshoes locate source of mystery web compromise", the source of the mystery injection of more than 10,000 websites back in January has been uncovered!

He says:

"Thousands of legitimate websites were compromised at the start of the year to serve up malware, as we reported at the time.

It seemed that the exploitation of SQL Injection vulnerabilities was involved in the automated attacks. The precise mechanism was unclear until earlier this week when security researchers discovered a malicious executable later linked to the attack on a hacker site.

The hacker utility used search engines to find insecure websites that it then tried to exploit using an SQL injection attack. The exploit included an SQL statement that tried to inject a script tag into every HTML page on the website.

The tool - which had an interface written in Chinese - was programmed by default to insert a tag to the same malicious JavaScript file that featured in the January attack, solid evidence that it was at least partially behind the assault.

The tool runs a script called pay.asp, hosted on a server in China. This suggests that hackers running the attack were keeping count of the number of sites they had compromised, in order to work out how much they stand to get paid.

Further analysis of the tool by security researchers at the SANS Institute's Internet Storm Centre (ISC) is ongoing. The tool came to their attention via a tip-off from Dr Neal Krawetz. The initial attack was uncovered by security researcher Mary Landesman, of ScanSafe, who described it as the time as a new type of compromise.

The constant, changing flux of the malicious JavaScript served up by compromised sites made initial analysis difficult. With the benefit of the hacker tool used to pull off the attack this all becomes much clearer, much like it was easier for scientists to unravel a cure for the mystery pandemic that blighted mankind in the Twelve Monkies after they obtained a sample of the pure source.

"The nice thing about this is that we finally managed to confirm that it is SQL Injection that was used in those attacks. The tool has more functionality that we still have to analyze but this is the main purpose," writes ISC handler Bojan Zdrnja.

Website owners ought to use the discovery as a wake up call on the need to ensure that their web applications are secure, he added."

If you are worried about SQL injection and other attacks on your website then you should take a look at Barracuda Network's newest solution called the Website Firewall. For more information or to arrange for an eval unit please visit: www.BarracudaNetworks.ca/Searchresult.aspx?CategoryID=74.

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 Thursday, April 10, 2008
Thursday, April 10, 2008 3:32:21 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | CudaMail | McAfee | S.P.A.M. | Spam Stats )
Don't get enough spam already and think you should get more? Then you will probably feel jealous of the 50 participants of McAfee's global Spammed Persistently All Month (S.P.A.M.) of April. These 50 regular Joe's ranging from 17 year old high school students (Hello Zach) to a mother of three (Zach's Mom Tracy) and a university student (Katya) among others in all areas of the globe are the guinea pigs in this experiment to run throughout April 2008.

Basically these participants have been given a dedicated laptop, a pre-paid credit card and a mission. Their mission is to do everything wrong and see what the results are. They are going to respond to Spam messages - buy the 'Genuine Replica Watches' on-line and sign up for everything they can and see what happens. William reported on Day 2 that without any protective software running he received 160 Spam messages and is getting pop-ups and browser hijacks 'on a regular basis'. The Blogs are a very interesting read.

Here Are My Predictions:

1. The laptops that these people are using will become a "willing soldier" in one of the Spam Bot armies lurking out there and may end up sending themselves (and us) more Spam. How is that for irony?

- Collectively the top botnets are capable of sending over 100 billion Spam messages per day*

2. Malware - The laptops will have to be wiped and re-installed for everyone at least once during the month. They are going to do this anyway for the participants at the end of the experiment before they get to keep them so this will be good practice. I'm not sure I would trust these laptops even after they are wiped though with the rootkits that are now being incorporated into the Bot software. Reports are coming in already that the laptops are slowing down and becoming unresponsive.

3. Massive consuption of time - the management of this Spam will take more and more time until these participants will not be able to do anything but read and reply to e-mail all day long.

4. Cyber Crime - all the participants have been given 'new identities' just like someone in the witness protection program to use online. I predict that some of these identities will be sold on the black market and thus stolen.

McAfee is of course going to use this experiment to advertise that there is a lot of Spam out there and that you need protection but I could have told you that - just look at the CudaMail statistics page. ;)

- Shaun

* Source: www.secureworks.com/research/threats/topbotnets/?threat=topbotnets

For More Information:

www.mcafeespamexperiment.com
www.echannelline.com/canada/printer.cfm?item=DLY040708-2

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 Wednesday, April 02, 2008
Wednesday, April 02, 2008 3:26:26 PM (Mountain Daylight Time, UTC-06:00) ( Anti-Spam | Barracuda Spam Firewalls | CudaMail | MX Backup | Spam Filtering Service )
Let's talk about what you can to do help make your e-mail both more reliable and keep Spam out of your client's mailboxes.
 
First, most people have this idea that e-mail is both near instant and 100% reliable - unfortunately, both of these ideas are 100% wrong!

The SMTP protocol was designed when Internet links were both unreliable and slow, therefore the protocol was built to be resilient and to retry failed messages. However, the link speeds have now increased and have become more reliable, therefore people have gotten used to their e-mail arriving really quickly and so they have come to the unreasonable expectation that e-mail is near instant and 100% reliable.

Let's look at a couple of scenarios that will show that this is not the case as well as address some ways to increase your control over your e-mail server's level of reliability.
 
Case 1 - Single Mail Exchanger
 
A lot of e-mail domains right now have only 1 Mail eXchanger (or MX record) typically pointing to a single mail server at the head office.

So what happens if your internet connection goes down or there is some "hiccup" with the mail server or your firewall (you do have a hardware firewall don't you?). Anyone who tries to e-mail you will not be able to and the sender may get an undeliverable messages (or not) from their mail server after some period of time.

The Sending mail server should be configured to retry this message to you a number of times at some interval both of which are set solely by the administrator of the sending mail server. In other words, you have no control over how often they will try again or for how long and it will be different for each and every mail server that is trying to send to you. Talk about a troubleshooting nightmare!
 
Case 2 - Backup Mail Exchanger

When you publish an MX record via DNS one of the properties of the record is a preference. Here is an example (fictitious) domain and the tools you would use to see what your MX record points to:
 
nslookup -type=mx somedomain.com
Non-authoritative answer:
somedomain.com        MX preference = 10, mail exchanger =
mail.somedomain.com
somedomain.com        MX preference = 99, mail exchanger =
smtp.SomedomainISP.com
 
What the above record is saying is that when sending e-mail to 'yourbuddy@somedomain.com' to first try sending it to the mail server named 'mail.somedomain.com' and if that fails to try and send the e-mail through the mail server named 'smtp.SomedomainISP.com'. Your ISP may even include this service for free if you ask them, however these 'store and forward' backup mail servers typically just accept and forward messages WITHOUT anti-spam processing and since they are from a trusted source (your ISP) most mail servers are configured to accept without further processing.

Guess what? The Spammers are aware of this little fact and will, in violation of the standard, try to send e-mail to your domain through your backup or secondary MX record. This is how a lot of Spam sneaks in today - it takes the back door and doesn't get challenged by the security guard at the front door - your primary anti-spam solution.

So what is the solution to this problem?

Case 3 - Spam filtered MX Backup service.

Make sure your backup or secondary MX record points to a system or systems that are as hard on Spam as the protection on or in front of your mail server. This is the reasoning behind our CudaMail MX Backup Service.

We (Optrics Engineering) have been Barracuda Diamond Partners for a number of years and have seen the above problems (Case 1 and Case 2) a number of times with the clients we deal with and are offering not just an MX backup service but a Spam Filtered MX Backup Service. We have a redundant cluster of Barracuda Spam Firewalls that we use to provide primary anti-spam protection for smaller organizations but can use these same servers to accept, scan for Spam and deliver to your mail server in the event that your anti-spam solution goes off-line or your Internet connection or firewall has an issue.

This cluster is configured to retry delivery to your mail server every 15 minutes for up to 48 hours. Those pesky Spammers who try to sneak in through the back door are going to be very surprised when they run into the CudaMail service on your secondary MX records and you now know how often and how long you have before people get an 'undeliverable' response back.

While e-mail is not 100% guaranteed the above service puts you in control and slams the door in the face of the Spammers.

Now go have a nice (Spam-free) day!

- Shaun

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About the author

Shaun Sturby, MCSE Shaun Sturby, MCSE
Technical Services Manager, and Optrics' point person for email security

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