SMTP Mailer

• SMTP Mailer is now compatible with WordPress 4.9.

• SMTP Mailer now supports the "wp_mail_failed" hook which fires after a phpmailerException is caught.
• Added a new option to bypass this error on some servers where the SSL certificate is not properly configured - Warning: stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Error messages: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed.

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