Enforcing STARTTLS on our MTAs

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As part of our SSL certificate refresh (our MTAs will be moving to a certificate with the serial number 23:40:f9:80:f4:b0:a4:cf:be:59:f0:51:8c:41:0b:10 soon) we thought it'd be a good opportunity to discuss why we violate RFC 3207 and enforce STARTTLS.

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