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Is the documentation provided in the patch for the LMTP
class not sufficient? I can extend on that if necessary,
although bear in mind that LMTP is very, very similar to
SMTP. The main difference is the support for Unix sockets.

As for adding test code, I could do that, although I'm
guessing most people will not have an LMTP capable server
running. If you feel strongly on this, I'll add something
that will check for port 2003, and submit the same test
message through an LMTP instance.