steelrazor Posted October 18, 2006 Posted October 18, 2006 Does anyone have any recommendations or suggestions for dealing with spam on an exchange server? At the moment our general school email address gets spammed to high heaven! I've got some ideas on how to deal with it but just wondered if anyone's got any spam solutions to recommend?
Geoff Posted October 18, 2006 Posted October 18, 2006 Stick a Linux front end mailer running spam assassin between it and the internet.
steelrazor Posted October 18, 2006 Author Posted October 18, 2006 Hehe, i'll have to get my head round linux first. Never used it! Is there a particular distribution i should be using (or do i not know what i'm talking about at all because i've just read up about linux for the past 10 minutes?)
Geoff Posted October 18, 2006 Posted October 18, 2006 Personally my favorite at the moment is Ubuntu. Of more importance is which MTA you use. Sendmail/Qmail aren't very newbie friendly. I'd recommend Postfix or preferably Exim for a beginner.
steelrazor Posted October 18, 2006 Author Posted October 18, 2006 I've got some homework to do then ;-) Thanks for the advice, am going to investigate into Ubuntu/Exim/SpamAssassin The stuff they don't tell you on Microsoft Exchange courses ey! random thought: (I really hate that "No more eating for you now" song they play on radio 1)
Norphy Posted October 18, 2006 Posted October 18, 2006 Are you running Exchange 2003? If you haven't already, set up the Intelligent Mail Filter on the Exchange server. It is part of Exchange 2003 SP2 and available as an addon for SP1 and before. It's not perfect but it helps eat a lot of spam.
OutToLunch Posted October 18, 2006 Posted October 18, 2006 Re IMF - Note that if you're using Exchange in a catchall/distribute POP3 scenario rather than a 'proper' SMTP setup, IMF does sweet FA; took me a good while to figure that out!!! Has anyone tried running SpamAssassin directly on their Exchange server? I've seen a few Windows ports/implementations of it that looked interesting...
Disease Posted October 18, 2006 Posted October 18, 2006 We use the GFI suite, works well. We have GFI Mail Essentials Mail Security and Archiver.
Simcfc73 Posted October 18, 2006 Posted October 18, 2006 We use GFI MailEssentials and MailSecurity. Cost about £800 last year for 100 mailboxes, just paid a renewal for the antivirus and spam filters and the support which was about £500. Very very easy to setup and use and it just works. This is what is caught in the last 12 months on a small network (100 staff mailboxes) Total Processed 54489 Total Spam 31101 Keyword Checking 1544 Header Checking 823 Blacklist 403 Bayesian Analysis 2582 DNS Blacklist 13510 SPF 288 Directory Harvesting 8228 Spam URL Blacklist 2905 Phishing URL Blacklist 818 Spam Percentage 57%
Geoff Posted October 18, 2006 Posted October 18, 2006 Spam Percentage 57% Pretty good, we're at 89% spam here.
Disease Posted October 18, 2006 Posted October 18, 2006 My Bayesian Analysis is at around 15k we are at around 90% all filtered at the moment, you always get some through though. An example is my head emailed me saying she had 8 Junk Emails in her in box even though 397 had been filtered out, not bad going really.
Simcfc73 Posted October 18, 2006 Posted October 18, 2006 I think my results were off because for the first 3 months I was the only one using it. In the past 7 days its ranged from 75% to 95% spam.
steelrazor Posted October 18, 2006 Author Posted October 18, 2006 What settings do people use for IMF eg. what SCL ratings do you usually have in place?
steve Posted October 18, 2006 Posted October 18, 2006 We have the block set at 8, with these being deleted. Junk Email SCL set at 6. Connection Filtering, we have 2 block lists setup: Spamhaus - sbl-xbl.spamhaus.org Spamcop - bl.spamcop.net With these and sophos puremessage, we now have very little spam. Well except for the internal stuff - I don't suppose anyone here wants one of our science technicians cats either
john Posted October 18, 2006 Posted October 18, 2006 I don't suppose anyone here wants one of our science technicians cats either ooh yes please, I love kittie cats send them to.......... (don't need any more viagra so won't post it here )
Ric_ Posted October 18, 2006 Posted October 18, 2006 Take a look at Proxmox Mail Gateway ( http://www.proxmox.com/ ) - this is the Linux solution you are looking for all configured for you with a lovely interface Plus it's free
john Posted October 18, 2006 Posted October 18, 2006 I use Puremessage and the IMF. I also, on those who that is still not enough use Spambayes on the local machine, it takes a few days of training but its a good program and learns fast.
ChrisH Posted October 18, 2006 Posted October 18, 2006 @ John Thanks I just tried that spambayes here at home and it worked a treat. It had plenty of mail in my junk folder to train from though .
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