Hi all!
Please excuse the long post - I wanted to add some background to explain
my position better.
A seemingly long time ago I ran qpsmtpd in front of my qmail servers
(actually I have a couple still running old 0.10 code out there). For
various configuration needs we moved from qmail to postfix, and hence at
the time a postfix -> amavisd-new -> postfix environment. This seemed to
give a good combination of features and performance and fit the bill
quite nicely for a long period of time.
As many of you many or may not know - amavisd-new is a heavy process, we
found that on a dual xeon server 10 child processes seemed to be the
optimal configuration for the spam/virus scanning. All works well until
a glut of email is delivered at one time which Postfix gladly accepts
and queueus and slowly trickles through to amavisd-new. This and some
other behavior has absolutely convinced me that it is time to move to a
mail service that can function as the mx receiver and spam/virus
filtering system at the same time (this way if one system is "busy" the
remote system will resend to one of our many alternate mx systems).
This has led me back to qpsmtpd and this post - namely some integration
questions based on our current configuration.
- Currently we use postfix to lookup/validate the recipient domain and
in some cases the recipient user before accepting the message. This is a
direct query to mysql - is this possible with qpsmtpd (without writing
plugins)?
- With amavisd-new we are customizing the spam/virus thresholds per
recipient domain and in some cases the user using a mysql lookup - is
this possible with qpsmtpd?
- Can I quarantine messages marked as spam/virus directly within qpsmtpd?
We have a very high volume mail gateway (several million emails per day)
, as I can tell I want to run the Apache::QPSMTP module for increased
performance. I found a note about a multiplexing server...
"For very high concurrency, you can use it as a multiplexing server. Two
large antispam companies' high-traffic spam traps have used this
effectively since the second quarter of 2005, delivering concurrency as
high as 10,000 on some occasions."
Is this documented somewhere that I can read more on?
Thanks in advance,
Max
