Noel Jones wrote:
On 12/11/2009 12:53 PM, Thomas Bolioli wrote:
This is an interesting. You are saying run amavisd as an MTA in between
postfix and the sending MTA to reject the spammy/virus messages inbound
and then send off to postfix everything else for delivery. What happens
to non deliverables? They will make it through the first transaction. Or
does amavisd reference postfix's configuration at all?
Thanks,
Tom
Please don't top-post.
The suggestions are to use an smtpd_proxy_filter (amavisd-new works
well for this), or a milter that supports spamd (google for "spamd
milter" for a hundred choices). Either of these approaches will allow
postfix to reject unknown users and the filter to reject unwanted mail
during the SMTP transaction.
Reading the documentation should answer most of your questions.
http://www.postfix.org/SMTPD_PROXY_README.html
http://www.postfix.org/MILTER_README.html
From an external viewpoint, there is no difference between using a
milter or a postfix smtpd_proxy_filter -- they offer identical end
results. Which one you choose depends more on what filter software
you want to use and which configuration you're more comfortable with
rather than technical merits.
You can also integrate clamav into the filter to reject viruses. If
you do use clamav, I highly recommend the Sanesecurity add-on
signatures to detect phish and spam.
http://www.sanesecurity.com/usage.htm
-- Noel Jones
Thank you for the help.
