From: Noel Jones (no email)
Date: Thu Sep 01 2005 - 12:02:51 EDT
At 08:31 AM 9/1/2005, Nick Powers wrote:
> > there mail gets distributed to 2 Mail Servers. When I look at netstat
> > for smtp connections I only see connections inbound from the 2 Qmail
> > MX hosts and none to my desitnation Groupwise servers. Every so often
> > when I look at netstat I see 1 or 2 connections to the Mail servers
Find where your bottleneck is. Are the Groupwise servers ready? Do
they respond quickly if you telnet port 25 from your postfix
box? What is postfix waiting on? Is the postfix box spinning it's
wheels on something? top/vmstat/iostat
Is your queue choked with a bizillion undeliverable deferred
messages? The qshape program will help determine that.
What about your content filter? is the mail in postfix waiting on
the content filter or on the destination?
http://www.postfix.org/TUNING_README.html
http://www.postfix.org/QSHAPE_README.html
qshape is bundled with Postfix 2.1 and newer source under the
"auxiliary" directory or available separately here:
http://www.stahl.bau.tu-bs.de/~hildeb/postfix/scripts/
>default_destination_concurrency_limit = 100
This seems insanely high. Only suitable for a system than never
sends mail to the internet (incoming only gateway), and where the
internal destination is prepared to accept 100 parallel
connections. This could be contributing to your problem if the
Groupwise servers can't handle this many connections. Postfix 2.2
has connection caching which improves performance when delivering
large amounts of mail to a small set of hosts.
>I would if I should be using canonical aliasing instead of
>virtual??? Could that cause a problem??
This is unlikely to be part of your performance problem.
Canonical_maps and virtual_alias_maps do different things for
different purposes. Which to use depends on what you want to
happen. Typically virtual_alias_maps are used to rewrite mail to the
correct internal address, cannonical_maps are used to rewrite
internal addresses to "standard" form.
http://www.postfix.org/ADDRESS_REWRITING_README.html#canonical
http://www.postfix.org/ADDRESS_REWRITING_README.html#virtual
-- Noel Jones
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