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Old 19 Sep 2015, 15:05
Dave Dave is offline
 
Join Date: Jun 2010
Real name: Dave
Well the error states "certificate verify failed" which means that the SSL/TLS certificate of the mail server is either invalid/expired/does not exist.

I believe the certificate check can be disabled, but that requires a modification to the class_mail.php file of vBulletin.
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