We had fairly good experience with TrendMicro (http://www.antivirus.com) viruswall and content filtering for mail. I did supplement it with postfix and spamassasin, since TrendMicro uses known spammers and keyword lists for filtering, an SA is has smarter pattern recognition.
I tried ClamAV in parallel to the TrendMicro virus scanner. Both captured the same viruses.
One of TrendMicro's packages has a pop mail checker, which I did not check as none of the sites I work in allow for POP or IMAP through the firewall.
For web virus filtering:
TrendMicro does a decent job, although I must say that I rarely saw viruses spread as a result of file downloads.
It's a little awkward with FTP, requiring a strange URI to work.
Best served with a side dish of squid.
For web content filtering:
Squid has two nice content filtering "add-ons" SquidGuard (http://www.squidguard.org/) which is sited based, and dansgurdian (http://dansguardian.org) which is content based.
Nathan Fain wrote:
Anyone know of a linux or unix based content filter gateway system? That filters at least smtp traffic, pop3 being the next in priority and http and ftp being useful features.
We have up to this point been using CA's eTrust as our traffic filter. It filters incoming and outgoing http, ftp, pop3 and smtp. It checks for viruses on emails and activex or java classes known to have problems. It is based on windows, and when I tell you it sucks trust me that it sucks divine ass (crashes constantly, creates loops of alert messages that gobble up bandwidth, etc..) We are now looking for a replacement and the proposals we have are for more windows based replacements. We are a linux shop and would prefer a linux or unix based content filter gateway system. Primary reason being for some reliability, second being because it opens doors for doing other interesting things with the gateway.
Thanks
Nathan
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