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.
I just managed to implement it. Hurray!
I'm on it, unless someone beats me to it.