From: Wietse Venema (wietseporcupine.org)
Date: Mon Apr 03 2006 - 19:56:36 CDT

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Victor Duchovni:
> On Mon, Apr 03, 2006 at 04:59:50PM -0700, wellssrimortgage.com wrote:
>
> > my postfix behind a firewall that always kills connections after 10
> > minutes, regardless of activity, I changed that , so the attachment size
> > problem is gone.
>
> Postfix does not do that. The smtpd(8) server kills connections after
> 300s ($smtpd_timeout) of *idle* time. If large attachments fail to
> be delivered without being rejected as too large, frequently the
> problem is broken PATH MTU discovery (often caused by firewalls
> that block ICMP).

It could be that his NAT is killing connections. Some
equipment believes that all clients are browsers.

        Wietse

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