How do I change the MTU

I recently switched Internet service providers here in the U.K. from Demon to TalkTalk. Since doing so I can't send mail from the TalkTalk account but I can receive mail into it.
The annoying thing is that everything worked fine on my wife's Windows PC when I set her new account up.
TalkTalk have suggested that I need to change the MTU on my Mac from 1500 (which they say is the Mac's default setting) to 1432. On searching Mac Help it explains how to do this in Tiger using an Ethernet connection but for Leopard using Airport it states to go into Mail Help and follow the instructions - not very helpful because there aren't any.
Does anyone know how I can adjust the MTU to 1432? TalkTalk did mention something about using a SUDO Command but didn't know the actual command to use and suggested that I contact Apple support.
Thought I would try you knowledgeable people first in the hope that someone can help.
Thanks, Mike

Hi, this site http://www.macfixit.com/article.php?story=20070416000657464 tells you how to change that and other setting, you can also test your internet speed herehttp://www.speedtest.net/ just incase its dear old BT playing about as I have encountered several times before. Hope this helps.

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