Thank you for reply Noel,
I've found some interesting info about smtp_connection_cache_destinations
and I've added the IP of my relay.
But to improve the interval between delivery and avoid a large of
deferred mail what else do you think should I change in my conf?
I've already set
queue_run_delay = 150s
minimal_backoff_time = 150s
maximal_backoff_time = 300s
I don't understand which Postfix process suffers.
Thank you for any suggestion.
Regards,
Roberto.
On 02/25/2014 01:39 PM, Noel Jones wrote:
On 2/25/2014 2:57 AM, Roberto Giordani wrote:
During one day the server deliveries about 40.000 emails, but during
working hours I receive repeated random periods where the Postfix
smtp client doesn't open any socket to destination main SMTPD server
and the maillog file write
dsn=4.4.2, status=deferred (conversation with
smtp.xxx.it[xxx.xx.xxx.xxx] timed out while sending MAIL FROM)
This behavior continues for about 5 minutes and on the next queue
manager run, all emails will be accepted and delivered.
At first time I though the problem was on the destination SMTP
server, but running tcpdump during "deferred" the server didn't open
any socket.
Any idea to understand and fix this behavior?
Likely this started with a timeout while sending MAIL FROM, then
postfix throttled the destination due to the failure.
See the tips on high-volume destinations in
http://www.postfix.org/QSHAPE_README.html#backlog
http://www.postfix.org/TUNING_README.html
-- Noel Jones
