[CentOS] Recommend Mail Server

Christopher Chan christopher.chan at bradbury.edu.hk
Thu Nov 26 02:24:53 UTC 2009


Thomas Harold wrote:
> On 11/25/2009 6:45 PM, Christopher Chan wrote:
>> Thomas Harold wrote:
>>>
>>> We use postfix, dovecot, clamav milter (reject at SMTP time), spf 
>>> policy
>>> check (with rejecting on SPF_FAIL at SMTP time), and AmavisD-New w/
>>> SpamAssassin for scoring what's left.
>>>
>> Have you looked at spamass-milter too?
>
> No, I must have overlooked that.
>
> We're taking advantage of a lot of the amavisd-new features that 
> enhance SpamAssassin.  OTOH, spamass-milter looks to be a lot simpler 
> to configure and would've allowed us to reject the super-high scoring 
> spam (>=25.0) during the SMTP transaction.

Heh. Showing guns at 10 over here.

>
> (I prefer to only reject on bogus HELO names, virus-infected messages 
> caught by ClamAV and SPF_FAILs at the moment.  Rejecting on a spam 
> score is trickier and more subjective.)

True that.

>
> One advantage of amavisd-new is that we could, if needed, move the 
> spam scoring off to a secondary internal server and round trip it back 
> to the primary mail server.  There are some other tricks that 
> amavisd-new handles beyond that (such as the policy banks, or the 
> ability to boost/lower a sender's email address or a sender's domain 
> by a few points instead of outright whitelisting/blacklisting).

Hmm, same with spamass-milter. spamd running elsewhere and accepting 
queries over the network. I don't know how much of the rest is supported 
by spamassassin rules whether individual or site but I suspect the 
latter is doable.


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