Hello Wietse,

Thx a lot for your quick reply.

I thought that the client side concurrency was defined by:

1) lmtp_destination_concurrency_limit
2) the number of lmtp processes

I have set them both to 1 now and still get the same error message. So I am starting to believe that there must be yet another configuration that I am unaware of. I have read many pages on the topic but haven't yet seen anything different from what I have done.

What I am missing?

regards,
Luciana

Wietse Venema wrote:
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

You need to reduce the CLIENT SIDE concurrency: fewer processes
in master.cf, for example.

        Wietse



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