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I'm wanting to setup a gateway mta on my linux box to sit in front of a Win32 based mail server. Ideally it will do inital spam and anti virus filtering for both local domains that may eventually be hosted on the 'nix box and domains hosted on the Win32 mail server. One of the requirements is that the linux MTA be able to verify an address is valid with the win32 server before delivery to avoid a round-robin invalid mail bounce problem.
I'm interested in opinions on which MTA would best suite my needs including the following requirements:
1) Must be able to validate a email address for delivery. SMTP verify is prefered to LDAP.
2) Must be able to block senders at the connection level (I.e by IP, or HELO statement) and update the config on the fly (Anyone have an existing script to grep for dictonary based spammers and dynamically add them to a connection level block?)
3) Must be able to support SMTP Authentication for selective outgoing senders.
4) Can anyone recommend a good 'nix based virus scanner that has frequently updated definitions that can keep up with the current Mytob crap outbreaks? Our current AV provider is taking days to catch new varients and I'd like to offer initial AV and spam scanning at the relay level.
We use Sophos to filter messages, but ClamAV is an Open Source AV with a good reputation. You can hook up Exim so that the message passes through several scans and use ClamAV in tandem with a proprietary product.