Alex:
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> Hi,
>
> I have a few postfix-2.8.7 systems on fedora15 that connect with
> another postfix-2.8.7 system. I'm receiving the following messages
> periodically in the logs:
>
> Apr 24 16:24:43 mailrelay postfix/smtpd[8814]: timeout after DATA
> (9832 bytes) from mail02.example.com[68.XXX.YYY.45]
tcpdump will show if this is an MTU problem, mis-handling of TCP
window scaling in a buggy firewall, or something else.
You can set the MTU with ifconfig commands; and Postfix has
tcp_windowsize parameter that allows you to prevent window scaling.
Wietse
