-instance, "Dan.Harkless" to "dan".
-
-The second way to override default construction of "From:" is to set the
-\fB$SIGNATURE\fR environment variable. This variable overrides the full name
-from the GECOS field, even if GECOS-based masquerading is being done. This
-processing is always active, and does not need to be enabled from mts.conf.
-
-The third way is controlled by the "plussed_user" value of "masquerade:" line of
-mts.conf. When that's turned on, setting the $USERPLUS environment variable
-will result in its value being tacked onto the user's login name, following
-a '+' sign. For instance, if I set $USERPLUS to "www", my "From:" line will
-contain "Dan Harkless <dan+www@machine.company.com>" (or "Dan.Harkless+www" if
-I'm using mmailid masquerading as well). Recent versions of sendmail
-automatically deliver all mail sent to \fIuser\fR+\fIstring\fR to \fIuser\fR.
-
-The fourth method of address masquerading is to specify a "From:" line manually
+instance, \*(lqDan.Harkless\*(rq to \*(lqdan\*(rq.
+.PP
+The second way to override default construction of \*(lqFrom:\*(rq is to set the
+.B $SIGNATURE
+environment variable. This variable overrides the full name
+from the GECOS field, even if GECOS\-based masquerading is being done. This
+processing is always active, and does not need to be enabled from
+.IR mts.conf .
+.PP
+The third way is controlled by the \*(lquser_extension\*(rq value of \*(lqmasquerade:\*(rq line
+of
+.IR mts.conf .
+When that's turned on, setting the
+.B $USERNAME_EXTENSION
+environment variable will result in its value being appended the user's login
+name. For instance, if I set
+.B $USERNAME_EXTENSION
+to \*(lq+www\*(rq, my \*(lqFrom:\*(rq
+line will contain \*(lqDan Harkless <dan+www@machine.company.com>\*(rq (or
+\*(lqDan.Harkless+www\*(rq if I'm using mmailid masquerading as well). Recent versions
+of
+.B sendmail
+automatically deliver all mail sent to
+.IR user + string
+to
+.IR user .
+.B qmail
+has a similar feature which uses '\-' as the delimiter by
+default, but can use other characters as well.
+.PP
+The fourth method of address masquerading is to specify a \*(lqFrom:\*(rq line manually