On Mon, 7 Jan 2008 17:31:27 -0800, Mark Sapiro wrote:
Why are there 121 messages being retried. What is in Mailman's smtp-failure log?
It is full of errors:
Jan 08 01:55:00 2008 (13316) All recipients refused: {'mak@rsmu.ru': (450, '4.1.2 <mak@rsmu.ru>: Recipient address rejected: Domain not found')}, msgid: <20080107110706.GC32553@nevod.ru> Jan 08 01:55:00 2008 (13316) delivery to mak@rsmu.ru failed with code 450: 4.1.2 <mak@rsmu.ru>: Recipient address rejected: Domain not found
You have two major, serious problems in your MTA configuration. First, it is doing DNS lookups on recipients at SMTP time. Apparently, from your followup post, when the recipient domain is invalid, it take 30 seconds for this lookup to time out.
You are absolutely right. There was domain check in Postfix:
smtpd_recipient_restrictions = reject_non_fqdn_recipient, reject_unknown_recipient_domain, check_recipient_access cdb:/etc/postfix/smtpd_recipient_restrictions, permit_mynetworks, reject_unauth_destination
I've moved "permit_mynetworks" upper and queue quickly got purged.
The second problem is when the domain is invalid, the MTA returns a 450 (retryable error) instead of a 550 which would record a bounce.
See some of the FAQs returned by <http://www.python.org/cgi-bin/faqw-mm.py?query=performance+mta&querytype=allkeywords&casefold=yes&req=search> for more info.
Thanks. ...
There are 8 Incoming, 8 Outgoing, 4 Retry and 4 Bounce qrunners on the server.
Why so many runners? Do you really need that much parallelism?
I thought they would process queue faster.
Once you resolve your MTA issues, I think you'll find that one slice per queue will be adequate.
Sure. Thank you very much!
-- Grigory Batalov, ALT Linux Team