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  1. #1

    Open source anti-spam/virus server?

    I want to set up a dedicated server for spam and virus filtering (MX)

    But i was wondering, is there a good opensource based tool for this?

  2. #2
    Join Date
    Feb 2008
    Location
    Austin, Texas
    Posts
    272
    You can use probably use Amavis to accept connections, do the filtering, and them relay them back to the server with some special configurations.
    ██ HermeTek Network Solutions
    ██ Network design, security, and implementation
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  3. #3
    Join Date
    Jul 2003
    Location
    Olean, NY
    Posts
    143
    Maia Mailguard

    Cheers,
    Erek
    System administration, application development, and project management.
    http://erek.blumenthals.com/blog/

  4. #4
    Join Date
    Jan 2008
    Posts
    47
    I use postfix/clamav/spamassassin/MailScanner and it works a treat. Same scenario, dedicated MX for all my inbound e-mail which then scans and forwards on clean mail to the recipient mailservers (which are set to receive mail only from the gateway mailserver).

    There's good documentation on the MailScanner site. (mailscanner.info I think)

  5. #5

    Mailscanner is nice solution. As felikz said, it sits before your mail server and can help you to eliminate all crap stuff (before it actually reaches your server).
    Sunil

    Windows Server Specialist / Windows Security Expert / 24*7 Hosting Support
    http://www.windows-administrators-on-hire.com/

  6. #6
    Join Date
    Jan 2008
    Location
    Spain|Catalonia|Barcelona
    Posts
    18
    ClamAV and SpamAssassin.
    "Security Through Obscurity" Linux most advanced operating system.

  7. #7
    Join Date
    Jan 2008
    Posts
    33
    http://assp.sourceforge.net/ open source and multi-platform
    MXSCAN :: AntiSpam & AntiVirus Solution for MailEnable (now with MESSAGE SNIFFER Support!)
    Built-in SpamAssassin, ClamAV, DNSBL, URLBL, DCC Check, ShortCircuit, Regex/Keyword Filters, Disclamers, Archiving, Indexing and more.
    Visit www.mxuptime.com for info.

  8. #8
    Join Date
    Jan 2008
    Posts
    47
    Quote Originally Posted by polarisie View Post
    http://assp.sourceforge.net/ open source and multi-platform
    I used to use ASSP and found it great (was just running it on one single domain) but I found when I started trying to use multiple domains I found that because it is a largely baynes-based filtering system it circumed to the "one mans spam is another mans ham" issue. For this reason I moved to MailScanner because it used spamassassin which, has bayes filtering, but also uses a lot more than just that to determin the rating of a message.

    ASSP is a brilliant package though, but I don't believe it's as good for ISP/gateway use as some of the alternatives.

  9. #9
    ClamAv and Spamassassin would be a good choice.

  10. #10
    Join Date
    Jan 2008
    Posts
    33
    Just something to add, if you're going with ClamAV for virus scanning you must check out the external SaneSecurity signatures. We've seen 70%+ spam catch rates for the overall spam caught via our system. A must have!

    And best of all its free
    MXSCAN :: AntiSpam & AntiVirus Solution for MailEnable (now with MESSAGE SNIFFER Support!)
    Built-in SpamAssassin, ClamAV, DNSBL, URLBL, DCC Check, ShortCircuit, Regex/Keyword Filters, Disclamers, Archiving, Indexing and more.
    Visit www.mxuptime.com for info.

  11. #11
    Join Date
    Jun 2005
    Posts
    3,448
    What do you mean with "one mans spam is another mans ham" ?

    I was looking into ASSP and it looks interested but I cannot see many users here using it. I would also be interested on what is the best solution integrated with Cpanel.

  12. #12
    Join Date
    Jan 2008
    Posts
    33
    Quote Originally Posted by nibb View Post
    What do you mean with "one mans spam is another mans ham" ?

    I was looking into ASSP and it looks interested but I cannot see many users here using it. I would also be interested on what is the best solution integrated with Cpanel.
    Bayesian databases are normally more effective when they are trained locally for your own server and domain. This is because what may be spam to you might be ham (good email) for another.

    In a shared hosting environment you could have thousands of users from different domains. Each receiving different kind of emails and from various industries. With a shared bayesian database the effectiveness of the database would depend on how it is trained.

    So in theory you could have other users training emails that they would classify as spam but which you regard as ham (non spam). But if the bayes database is shared among the users on a particular server this could lead to false classification.

    "one mans means is another's poision" :-)
    MXSCAN :: AntiSpam & AntiVirus Solution for MailEnable (now with MESSAGE SNIFFER Support!)
    Built-in SpamAssassin, ClamAV, DNSBL, URLBL, DCC Check, ShortCircuit, Regex/Keyword Filters, Disclamers, Archiving, Indexing and more.
    Visit www.mxuptime.com for info.

  13. #13
    Join Date
    Jan 2008
    Posts
    47
    ASSP can be integrated with CPanel ... http://www.grscripts.com/

    as for the quote, what I found was that because I host for a vast array of businesses what one company would treat as spam would cause legitimate email for other companies to also be treat as spam. For a single company or personal e-mail it does work well, but for multi-company hosting, in my testing, it caused quite a fwe problems and I had to stop using it ... which is a shame because it's a really nice little package.

  14. #14
    Join Date
    Jun 2005
    Posts
    3,448
    Ok I get it. That must be why Spamassassin is a such a resource hog.

    What you guys mean is that ASSP shares the bayesian filter and Spam assasin doesnt right?

    Well that could be a problem since you are right. A specific email could be spam for someone but a valid email for another. If you have allot of customers on a server it could represent a problem unless most customers are the same target of business.

    Yes i see ASSP integrates with Cpanel. Im so happy Cpanel has so many addons. Im really glad im dumping plesk. So what would be a good solution for new servers with Cpanel then?

    I also see Cpanel comes with Exim, correct me if im wrong but is Postfix supported? Plesk comes with qmail which is horrible.

    How about other nice features for Cpanel, I only found ASSP and RvSkin so far but i would be interested on other tuning people do to Cpanel servers.

    Email is of course my main interested. I have spam solutions but they are to expensive for the small client that has 2 emails. Im looking for real hosting alternatives not paid ones, or if they are paid like ASSP Deluxe plugin they should be on a 1 time fee per server not monthly or per email account. Most things are still open source and im hope there is something good that works better then Spamassassin. Is Spamassasin really so bad or people just dont configure it well? If its so defective why is it so popular?

  15. #15
    Join Date
    Jan 2008
    Posts
    47
    I have no problem with SpamAssassin, the issue I think is that there is so much uncertainty. I have mine set to delete anything with a spamassassin score of 10 or greater and to mark anything scored above 5 as spam ... I still see spam coming through but it catches a lot of it.

    The place I have seen great success is with grey listing. I implemented grey listing on my backup mailservers and instantly I saw a 90% reduction in spam.

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