How does Emacs inject mail?

I do not know---I am trying to look at sendmail-send-it () in
sendmail.el, and I think the crucial part is 
                                     (if (boundp 'sendmail-program)
                                         sendmail-program
                                       "/usr/lib/sendmail")
                                     nil errbuf nil "-oi")

But I know nothing about the sendmail flags (no documentation of them
in the qmail distr).

Mate

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