From: Wietse Venema (wietseporcupine.org)
Date: Thu Feb 01 2007 - 13:27:00 CST

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Anton Yuzhaninov:
> Hello, Wietse.
>
> > Does the poster understand that Postfix's time limits are not
> > limiting the total duration of the DATA command, but rather, the
> > time for each individual read/write operation?
>
> Yes, I understand this. But 60 seconds for each individual read/write
> operation it is not enough for very slow connections (gsm gprs, dial-up).

I don't think so.

In the DATA stage, Postfix reads up to 4096 bytes at a time. With
a 60-second time limit per read operation, this breaks only when
the data rate falls under 68 bytes per second. This is not a
problem with dialup, not even with with SLIP over 300 baud.

Postfix was developed on a dialup-connected server, and my server
is currently using its backup dialup connection again, because the
better connection is flakey during some weather patterns.

So, what is the problem with gsm gprs?

        Wietse

> Decreasing default timeouts really need only before DATA command to
> prevent spambots to eat all connections.
>
> --
> WBR,
> Anton Yuzhaninov
>
>
>

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