How fix mail security cert name mismatch warning

Mail is periodically warning about trusting "inbound.att.net" when connecting to "pop.att.yahoo.com".
It says: "This certificate is not valid (host name mismatch)"
and it warns that I may be the victim of foul play.
I have avoided checking the "always trust" box and am trusting as each warning appears.
(iMac is brand new; have never seen any such message on WindowsXP computer in recent use with same mail account using Thunderbird.)
Should I take this as a serious security warning?
Just need to change some setting?  (They all match AT&T's requirements as far as I can see.)
A problem at AT&T / Yahoo?
Thanks for any suggestions!

Maribod,
You also may want to repost in the Mail and Address Book forum. Click Apple Support Communities then type Snow Leopard and click Refine this list where you will find information on Mail and Address Book. Mail and Address book are part of OS X which is why they are in the Snow Leopard forum.
Roger

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