From: Wietse Venema (wietseporcupine.org)
Date: Tue May 01 2007 - 07:13:32 CDT

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Hargis, Mandy:
>
> >So messages arrive at the remote site, but the Postfix SMTP client
> times out before the remote server responds to "."
>
> That is what appears to be happening. The recipient definitely gets the
> message (multiple times).
>
> >What is the output from:
> >postconf | grep smtp_data_
>
> smtp_data_done_timeout = 600s
> smtp_data_init_timeout = 120s
> smtp_data_xfer_timeout = 180s

So the remote server does not respond to "." in 600s.

Are you perhaps behind a NAT gateway? This may expire the connection
from its tables too early. Such boxes tend to be optimized for
short-lived http connections which is bad for email.

Is the remote SMTP server behind a NAT gateway?

In either case, it may help to turn on keep-alives.,
For example, in FreeBSD:

    sysctl -w net.inet.tcp.keepidle=100000

This is currently not built into Postfix.

> >Is the timeout problem message size dependent?
> No, many messages are smaller than 8k in size.

Are there large messages that DON'T fail?

> >How many of those messages are you sending in parallel?
> One message/recipient.

How many EMAIL MESSAGES are you sending in parallel?

        Wietse

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