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XF 1.5 Problem with sending eMails

Hello xenForo Community,
I got a self signed SSL certificat but when I try to send an eMail via TLS I got the following error message:
ErrorException: Email to xyz@xyz.us failed: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed - library/Zend/Mail/Protocol/Smtp.php:206
Generated By: xyz, 22 minutes ago
But when I send an eMail via Roundcube/Thunderbird all is working aswell.
Best regards