Documentation can be found at http://tcllib.sourceforge.net/doc/smtp.html


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Here's a minimal useful example:
      proc send_simple_message {recipient email_server subject body} {
          package require smtp
          package require mime

          set token [mime::initialize -canonical text/plain -string $body]
          mime::setheader $token Subject $subject
          smtp::sendmessage $token \
                  -recipients $recipient -servers $email_server
          mime::finalize $token
      }

      send_simple_message someone@somewhere.com localhost \
                "This is the subject." "This is the message."
OK, this is more minimal:
         ...
      set token [mime::initialize -canonical text/plain -string $body]
      smtp::sendmessage $token \
              -header [list Subject $subject] \
              -header [list To $recipient]
      mime::finalize $token_
         ...



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[Category Package], subset [Tcllib]