\fB$USERNAME_EXTENSION\fR to "+\fIstring\fR". These MTA features are useful
because they allow one to use different email addresses in different situations
(to aid in automatic mail filtering or in determining where spammers got one's
-address) while only actually having a single account.
+address) while only actually having a single account. Note that
+\fB$USERNAME_EXTENSION\fR is only appended to the username when \fIpost\fR is
+generating "[Resent\-]From:" lines and the SMTP envelope "From:". \fIinc\fR,
+for instance, will not try to read from a maildrop file called "dan\-www" (to
+recall the earlier example).
"draft_from" controls the most powerful type of address masquerading. Normally,
when a user explicitly specifies a "From:" header in a draft, \fInmh\fR uses it
.in -.5i
.Uh "Post Office Protocol"
This option is only available if you have compiled \fInmh\fP with POP
-support enabled (i.e., \*(lq--enable-nmh-pop\*(rq).
+support enabled (i.e., \*(lq--enable-pop\*(rq).
.in +.5i
.ti -.5i