E-mail error is really annoying

[lizardbrains]

Hi, all! I have an HTC Mogul. I have it set up to push my e-mail through the e-mail application. It works just fine - pushes my e-mail in a timely fashion, etc. BUT every couple minutes it gives an error message:

Incoming E-mail Password
Check user name and password and try again.

The screen has the boxes with my user name and passwords already entered. I can edit those, it has a "save password" check box, and I can press OK or Cancel. I always just hit cancel, and go on with whatever I was doing. It still pushes my e-mail just fine. If I hit "ok" or anything else besides cancel, it just keeps giving me the error message (above) with the same screen. Then eventually it gives me another error message saying:

Cannot connect to the incoming mail server. Be certain that your login information is correct, then try again to send and receive mail.

Yet it eventually does retrieve my e-mail.

On a side note... When I am manually sending an e-mail, it will give me the "cannot connect" error message, but then eventually (in 5-15 minutes or so) it does get it sent.

I don't mind, since the e-mail function does indeed work. But it's really annoying to get interrupted in everything I'm doing all the time with the error screen. I just hit cancel, and continue whatever I was doing, but it truly is annoying.

BTW my DH got a Mogul at the same time as I did, and his does not do this. I don't care to return my Mogul b/c it would be very inconvenient (long drive, big hassle, etc.).

Am I the only one with this problem? Can this be resolved? Or is it something I just have to deal with? Please advise! Any help would be greatly appreciated!

P.S. Some things I've tried:
~ Used a different e-mail address, and it worked just fine. Nice. But I want to use the e-mail address I actually use!
~ Changed my password on the account. Still does the same errors.
~ I do wonder if this has to do with my e-mail address having a dot in it... but why would that cause any error?