The commercial mailserver software we use includes antispam and antivirus plugins from a German company CYREN. I do see some false negatives, but it seems to have zero or nearly zero false positives.
I see on their website that they offer anti-spam as a service which sounds very similar to the old Postini, their servers are in Germany though. From: Mike Hammett Sent: Thursday, April 02, 2015 9:12 AM To: af@afmug.com Subject: Re: [AFMUG] open source email spam filter A lot of people are concerned with stopping the mail before it hits the mail environment. That doesn't really matter to me. CPU cycles are CPU cycles. Whether I spin up VMs for dedicated SPAM systems or spin up additional MTAs for the cluster... doesn't make a difference. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "Vlad Sedov" <v...@atlasok.com> To: af@afmug.com Sent: Thursday, April 2, 2015 9:09:04 AM Subject: Re: [AFMUG] open source email spam filter I recently deployed ASSP on one of our mail servers. It's a SMTP proxy that filters incoming mail before it hits your main MX. It actually works quite well, and can be managed via the web interface. Has full whitelist/blacklist/greylist support. It can also scan for viruses using your favorite a/v client. We also run our own RBL server, and frequent fliers and known spam sources get thrown in there, often permanently. Vlad On 4/2/2015 7:03 AM, David Milholen wrote: Agreed, I mentioned the Spamdyke because its free versatile on any server and cost nothing unless you donate. I have also moved businesses to our server to host or park their domain. We do not advertise this but its good steady revenue without much work. Spamdyke also has great logging and stats for which there are some additional code that can be installed to send a daily report if you really need to know how well its doing its job. Here is an example There are other list that can be enabled if needed. This report was generated Wed Apr 1 00:05:15 2015 38502 65.84% ALLOWED 9562 16.35% DENIED_RBL_MATCH --------------- Breakdown --------------- ----------------------------------------- 3977 6.80% DENIED_RDNS_RESOLVE 2604 4.45% DENIED_BLACKLIST_IP 1520 2.59% DENIED_RHSBL_MATCH --------------- Breakdown --------------- ----------------------------------------- 750 1.28% DENIED_IP_IN_CC_RDNS 722 1.23% DENIED_OTHER 469 0.80% DENIED_SENDER_NO_MX 251 0.42% DENIED_BLACKLIST_NAME 69 0.11% TIMEOUT 41 0.07% DENIED_SENDER_BLACKLISTED 6 0.01% DENIED_IDENTICAL_SENDER_RECIPIENT 5 0.00% DENIED_IP_IN_RDNS --------------- Breakdown --------------- ----------------------------------------- ---------------- Summary ---------------- Allowed: 38502 65.84% Timeout: 69 0.11% Errors : 0 0.00% Denied : 19907 34.04% Total : 58478 100.00% On 4/1/2015 10:40 PM, Lewis Bergman wrote: And you will continue to pay more, in time if nothing else, to maintain it than it will ever bring in revenue. But to each his own. I would have said the same thing years ago. On Apr 1, 2015 4:27 PM, "Tim Reichhart" <t...@nwohiobb.com> wrote: Josh As I already stated I don’t like gmail and I already have an email server setup. Tim From: Af [mailto:af-boun...@afmug.com] On Behalf Of Josh Luthman Sent: Wednesday, April 01, 2015 5:17 PM To: af@afmug.com Subject: Re: [AFMUG] open source email spam filter Gmail on pop/imap Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373 On Apr 1, 2015 5:06 PM, "Tim Reichhart" <t...@nwohiobb.com> wrote: I have tried gmail before and I didn’t like it… Tim From: Af [mailto:af-boun...@afmug.com] On Behalf Of Chuck McCown Sent: Wednesday, April 01, 2015 5:04 PM To: af@afmug.com Subject: Re: [AFMUG] open source email spam filter gmail... From: Tim Reichhart Sent: Wednesday, April 01, 2015 2:53 PM To: af@afmug.com Subject: [AFMUG] open source email spam filter Hey Guys Who do you guys use for spam filter like barracuda but in open source for your email server? Tim --
