Richard Coleman escribió:
I am running a mail server using Postfix and Dovecot. I would like to
hear people's recommendation for which port to use to add server side
anti-spam. The problem these days is a richness of choices, so it's
hard to know port which to try.
And call it a quirk of mine, but I really dislike (server) software
with a large number of dependencies. That rules out Spam Assassin.
But I am fairly conversant with mail and Postfix/Dovecot in general,
so I don't mind any integration work.
I apologize if this has been discussed before, but I just joined the
list (I am already on so many FreeBSD lists already). I appreciate
any insight that people can offer.
I think the most common (and thus more mature) solution for this are
amavisd-new + SpamAssassin + clamav, they have a lot of dependencies,
though. Clamav catches all the viruses, just the spams had caused
problems with this configuration, before I started to use postgrey.
I see your concerns about dependencies, but I think sometimes we have to
make sacrifices for the most appropriate choice. This also applies to
the next solution I recommend you and this is greylisting with postgrey.
It does not have too much dependency, but it works in a way, that you
can loose important mails as well.
The concept of greylisting is that the server responds to the sender
with an error code meaning a temporary failure and places the sender to
a list called greylist when a mail is being sent. After some minutes (5
or so), well-configured STMP servers resend the mail, when your server
notices, that the given server was greylisted, and now it can be
trusted. Spam bots don't usually resend mails, they are too primitive
for this atm. It can change in the future, but for now, the method
works, it's been very well for me. The only problem is that there are
STMP server that are configured in a weird way and they don't send out
mails later again. Postgrey offers a solution, though. You can place
such servers to a whitelist and they will be excluded from the greylisting.
I have heard good experiences about dspam as well, but haven't used it,
thus I can't form any opinion.
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