lmtp concurrency configuration

[Luciana Moreira Signed by - PrivaSphere AG]

Hello guys,

I am trying to tunne our postfix installation. In our setup we receive mails, pass them after an anti-virus milter to a internal mail processing system that uses lmtp using a content filter, and then forward the mail to the final destination. Since I have full control over the internal mail processing system, ideally I should be able to define the number of processes in such a way that all requests would get through without getting deferred between the internal hops. Unfortunately this is not the case. Several messages are going to the deferred queue with the mesage bellow:

0EEF34A925     1247 Thu Jun 24 16:38:19  f...@foo.com
   (lost connection with 171.20.1.10[171.20.1.10] while sending MAIL FROM)
                                         jm-tes...@mydomain.com

The internal server is configured with 10 listeners. So my goal is to configure postfix to process a maximum of 10 messages in parallel.

Here are some of the parameters I have tried on main.cf

lmtp_destination_concurrency_limit=1
content_filter = lmtpd:172.25.11.193:7026

on master.cf

171.20.1.10:2025      inet  n       -       n       -      10       smtpd

lmtpd      unix  -       -       n       -       10      lmtp
    -o lmtp_data_done_timeout=1200
    -o lmtp_send_xforward_command=yes

Any ideas?

Thx in advance






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