Add sSMTP post.

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+[[!meta  title="sSMTP"]]
+
+[sSMTP][] is a simple [[SMTP]] client for sending mail from your local
+client to a mail hub with a more serious [MTA][].  For example, my
+main server is running [[Postfix]], but I want to send mail from my
+laptop.  I use sSMTP to do this.
+
+Before you use sSMTP, you need to configure it so it knows how to
+connect to the mail hub.  My `/etc/ssmtp/ssmtp.conf` is:
+
+    root=jdoe
+    mailhub=mail.example.net
+    rewriteDomain=example.com
+
+This sends mail via `mail.example.net`, and replaces my current domain
+name with `example.com`.  `jdoe@mail.example.net` will recieve all
+system-generated email (i.e. cron job output).
+
+There are other settings available in the config file.  The stock
+config contains lots of comments explaining how to use them, and the
+`ssmtp.conf` man page contains even more details.
+
+I felt like the [[SSL/TLS|GnuTLS]] handling for sSMTP was a bit sparse
+(for example, it doesn't validate the server certificate), so I've
+submitted some patches upstream ([662958][] and [662960][]).
+
+If sSMTP doesn't scratch your itch, the next level up in terms of
+features is [msmtp][], which I used to use before I setup my own mail
+hub.
+
+[sSMTP]: http://packages.qa.debian.org/s/ssmtp.html
+[MTA]: http://en.wikipedia.org/wiki/Message_transfer_agent
+[msmtp]: http://msmtp.sourceforge.net/
+[662958]: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=662958
+[662960]: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=662960