Why has my yahoo email stopped working on my Palm Pre Plus?

sweetsupplies85

New member
This morning I got a message that my yahoo emails stopped working on my Palm Pre (Plus). Its saying the server’s security certificate is not valid for palm.imap.mail.yahoo.com. What is going on? I restarted the phone, tried to re-add the email accounts and same thing. My gmail is working, but not those. Any suggestions?
 
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