[Dovecot] Lots of LMTP errors Remote server not answering (DATA output timeout) (in reply to end of DATA command))
Angel L. Mateo
amateo at um.es
Fri Jul 8 15:04:05 EEST 2011
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.
--
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
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