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system/1878: MTU problem when sending mail using postfix

>Number:         1878
>Category:       system
>Synopsis:       Enabling MTU on a 2.9 box causes lost connection
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 15 02:20:01 MDT 2001
>Originator:     Vincent Bernat
>Release:        2.9
	Pentium 133, 96 Mb of RAM, dialup connection (56 Kb)
	System      : OpenBSD 2.9
	Architecture: OpenBSD.i386
	Machine     : i386
	When MTU discovery is enabled, Postfix loses connection after
sending each mail resulting in sending the mail several time. A
tcpdump shows that MTU discovery doesn't work (fragmented packets come
	Enable MTU discovery and send ten mails at once
	Disabling MTU discovery