Did the telnet localhost 25, it answered but not sure I understood you what I needed to do.
type all this in once connected, substituting as necessary & ignoring the comments in ()
helo mydomain.com (substitute a valid domain here) mail from: someuser@validdomain.com rcpt to: youremailaddress@yourdomain.com data From: someuser@validdomain.com to: youremailaddress@yourdomain.com subject: test (note blank line here) This is a test message .