El 08/07/11 14:04, Angel L. Mateo escribió:
El 08/07/11 12:18, Angel L. Mateo escribió:
Hello,
I have configured two dovecot servers with director acting as
lmtp/imap/pop proxy server with 8 dovecot backend servers.
In our test environment we had no problem, but when we migrated to
production environment, our mail list server (it delivers mail through
lmtp) is having a lot of errors like this:
451 4.4.0 Remote server not answering (DATA output timeout) (in reply to
end of DATA command))
Proxy and backend servers are not loaded.
Any idea?
By now, I think I have resolved the problem. We have limited the rate at
what list server delivers mail to dovecot. The default postfix
configuration is:
lmtp_destination_concurrency_limit = 20
lmtp_destination_recipient_limit = 50
that is,
a maximum of 20 lmtp concurrence connections with a maximum of 50
recipients per connection. We have decrease to 5 and 10 and since then
we have no more data output timeout errors.
This wasn't a fix. Although it works temporally and alleviate the
problem, it didn't completely fixed and I get sporadic errors like:
Jul 11 13:46:25 xenon14 postfix/lmtp[7063]: A0ECA5D49E:
to=<[email protected]>, relay=pop.um.es[155.54.212.106]:24, delay=599,
delays=569/0/0/30, dsn=4.4.0, status=deferred (host
pop.um.es[155.54.212.106] said: 451 4.4.0 Remote server not answering
(DATA output timeout) (in reply to end of DATA command))
Any idea of what is the reason for this?
--
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información _o)
y las Comunicaciones Aplicadas (ATICA) / \\
http://www.um.es/atica _(___V
Tfo: 868887590
Fax: 868888337
