PHPMailer generates PHP Warning: stream_socket_enable_crypto(): Peer certificate did not match expected

Question

I am using PHPMailer on PHP 5.6, the increased security around certificated in PHP 5.6 is certainly fun.

I am trying to send a test message to a domain hosted on dre

Answer 1

I had a similar problem after I've upgraded to PHP 5.6 on my WordPress machine. The WP Mail SMTP by WPForms (wp-mail-smtp) plugin were configured to use localhost as SMTP Host. I've changed it to the FQHN (Fully Qualified Host Name) as it is defined in the SSL cert. After this change it is working fine.