Warning: stream_socket_enable_crypto() [function.stream-socket-enable-crypto]: Peer certificate CN=

Hi WPMU Dev.

On my clients website, I get this error when tried to sendt emails out from the contact form:
Warning: stream_socket_enable_crypto() [function.stream-socket-enable-crypto]: Peer certificate CN=*.unoeuro.com' did not match expected CN=localhost' in /var/www/cultureadventure.dk/nyt/wp-includes/class-smtp.php on line 367

I have fixed the issue before, by editing some of the lines in some file, but I can't remember what I did the last time. It happens when this form is filled: http://nyt.cultureadventure.dk/bestil_rejse/

Please help..