Mailer/#41: SSL support

Bug report from khorben on 05/06/2011 05:13:07
For both POP3, IMAP4 and SMTP support to really be useful, SSL support needs to be integrated globally.

Thankfully glib's GIO sub-system supports it for some time now, so it should be fairly easy to integrate it.
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I just managed to implement it. Hurray!
I'm on it, unless someone beats me to it.