SSL certificate not valid

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Just started receiving 'server's security certificate not valid for palm.imap.mail.yahoo.com' error early this morning. I have a (Sprint) Palm Pre (P100EWW) on version 1.4.1.1. How do I correct?
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I have tried removing palm and still cannot get it to work!   any other ideas?   I did notice it changed the port to 995 when I first was entering my email info.   It used to be set to 993?
Also, what do you put in the username....  is that the beginning part of the yahoo id prior to @yahoo.com?