-This facility is useful if you are using POP, and wish for messages
-that are sent by users to appear to originate from the username of
-their POP account, rather than their username on the local machine.
+.ti +.5i
+First [Middle] Last <First.Last>
+
+The other type of masquerading that mmailid turns on is envelope "From:"
+masquerading based on draft contents. When a user explicitly specifies a
+"From:" header in a message, \fInmh\fR uses it rather than constructing its own.
+However, the SMTP envelope "From:" and the "Sender:" header are set to the
+user's real address. Turning on mmailid prevents this latter behavior. This is
+useful when the user wants to pretend to be sending mail "directly" from a
+remote POP3 account, or when remote mail robots incorrectly use the envelope
+"From:" in preference to the body "From:" (or refuse to take action when the two
+don't match).