Wireshark-users: Re: [Wireshark-users] Bizarre mail issue on network, Please someone, help.

From: "Dave Wombat" <dave.wombat@xxxxxxxxx>
Date: Sun, 6 May 2007 15:49:51 -0700

Sounds like an Ethernet mismatch.  Check the Ethernet parameters on your e-mail
server and your Ethernet switch.  A speed or duplex mismatch can cause this
kind of behaviour.

In particular for Sun & Cisco this kind of slowness with duplex
mismatch is too common.