Resolves Issue #986 - Turn off opportunistic TLS when disabled. #987
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This ensures that when you have disabled 'secure' in your mail
config no TLS attempts are ... attempted.
This is because PHPMailer requires a valid Certificate, which
may not always be available. See:
https://github.com/PHPMailer/PHPMailer/blob/master/src/PHPMailer.php#L282
Signed-Off-By: Rob Thomas xrobau@gmail.com