3 posts within 40 minutes? Patience.

You mean sendmail? I don't think that's available. The easiest option would probably be a "sendmail type" perl/python script - there should be lots of those around if you google a bit. Another option is to install claws-mail which I think you can run from the command line with the appropriate options to send mail directly without going through the gui - but it's a bit of an overkill.