Been having trouble trying to setup hotpop for my t-mobile treo 600.

At the "myemail" site, I try to configure the mailbox for hotpop using the settings they provide on their website:

password: (my hotpop password)
(not using "SSL")

t-mobile's myemail keeps telling me that and "error occurred while validating the login." it tells me to recheck my username and password, but i've done that and they're right.

can't find any posts about problems with hotpop--can someone please help me? am I making some kind of stupid mistake?

thanks so much!