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BenM · 14th April 2006

Hi,

I'm looking to build some new mail relays to replace our aging sendmail set-up, and would like to consider an alternative MTA such as Postfix or Exim.

We need the following features:

Optional SMTP authentication (against LDAP), otherwise restrict relaying to local domains.

DNSBL

sender verification callbacks and greylisting

spam filtering

virus scanning

We currently use sendmail with SASL, milter-sender, milter-amavis, amavisd, SpamAssasin and ClamAV to acheive all this (minus LDAP), however, I'm not entirely happy with the reliability of this solution.

There seems to be a fair few options for open source software out there that can do this kind of stuff now, and a bewildering array of ways to put them together. My biggest priority is reliability, but clarity of configuration and overall performance are also important.

On the later point, I've seen various reports of some MTA's performing better than others, but nothing that takes into account the whole system including spam and AV filtering. Since Spam and AV filtering will be most of the work done by these servers, it is perhaps more important how efficiently the MTA interfaces to the Spam and AV filtering than the raw speed of the MTA.

So what combinations of software do you folks use and/or recommend?

Cheers,
Ben.

14th April 2006	#1 (permalink)
BenM Found the Computer Join Date: Mar 2006 Posts: 12	Mail relaying, spam and antivirus Hi, I'm looking to build some new mail relays to replace our aging sendmail set-up, and would like to consider an alternative MTA such as Postfix or Exim. We need the following features: Optional SMTP authentication (against LDAP), otherwise restrict relaying to local domains. DNSBL sender verification callbacks and greylisting spam filtering virus scanning We currently use sendmail with SASL, milter-sender, milter-amavis, amavisd, SpamAssasin and ClamAV to acheive all this (minus LDAP), however, I'm not entirely happy with the reliability of this solution. There seems to be a fair few options for open source software out there that can do this kind of stuff now, and a bewildering array of ways to put them together. My biggest priority is reliability, but clarity of configuration and overall performance are also important. On the later point, I've seen various reports of some MTA's performing better than others, but nothing that takes into account the whole system including spam and AV filtering. Since Spam and AV filtering will be most of the work done by these servers, it is perhaps more important how efficiently the MTA interfaces to the Spam and AV filtering than the raw speed of the MTA. So what combinations of software do you folks use and/or recommend? Cheers, Ben.