Patch: forcing SSL before auth

[Carlos Velasco]

> From: Bron Gondwana <brong at fastmail.fm>
> Date: 9/8/2015 13:24:05

> I'm happy with that.  We go a step further at FastMail and require SSL always (port 993).  See arguments here:
> https://www.fastmail.com/help/technical/ssltlsstarttls.html

Problem with port 993 is that enterprise firewalls (at least here in Spain) usually block this port but allow 143 (sigh).