-It is useful for seeing how \fInmh\fR will interpret an address.
-
-The \fIap\fR program treats each argument as one or more addresses, and
-prints those addresses out in the official 822\-format. Hence, it is
-usually best to enclose each argument in double\-quotes for the shell.
-
-To override the output format used by \fIap\fR, the `\-format\ string' or
-`\-format\ file' switches are used. This permits individual fields of
+It is useful for seeing how
+.B nmh
+will interpret an address.
+.PP
+The
+.B ap
+program treats each argument as one or more addresses, and
+prints those addresses out in the official RFC 822 format. Hence, it is
+usually best to enclose each argument in quotes for the shell.
+.PP
+To override the output format used by
+.BR ap ,
+the
+.B \-format
+.I string
+or
+.B \-format
+.I file
+switches are used. This permits individual fields of