There is no \(ua in roff, you really mean \(ha (Circumflex-Accent) aka ^

usr.bin/mail/USD.doc/mail5.nr

@@ -1,4 +1,4 @@
-.\"	$NetBSD: mail5.nr,v 1.5 2003/08/07 11:14:45 agc Exp $
+.\"	$NetBSD: mail5.nr,v 1.6 2014/09/30 20:54:11 christos Exp $
 .\"
 .\" Copyright (c) 1980, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -58,7 +58,7 @@ consists of a list of message numbers, ranges, and names,
 separated by spaces or tabs.  Message numbers may be either
 decimal numbers, which directly specify messages, or one of the
 special characters
-.q \(ua
+.q \(ha
 .q "."
 or
 .q "$"

usr.bin/mail/USD.doc/mail9.nr

@@ -1,4 +1,4 @@
-.\"	$NetBSD: mail9.nr,v 1.4 2003/08/07 11:14:46 agc Exp $
+.\"	$NetBSD: mail9.nr,v 1.5 2014/09/30 20:54:11 christos Exp $
 .\"
 .\" Copyright (c) 1980, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -121,7 +121,7 @@ escape	valued	Escape character to be used instead of\ \ ~
 folder	valued	Directory to store folders in
 hold	binary	Hold messages in system mailbox by default
 ignore	binary	Ignore \s-2RUBOUT\s0 while sending mail
-ignoreeof	binary	Don't terminate letters/command input with \fB\(uaD\fP
+ignoreeof	binary	Don't terminate letters/command input with \fB\(haD\fP
 keep	binary	Don't unlink system mailbox when empty
 keepsave	binary	Don't delete \fBsave\fPd messages by default
 metoo	binary	Include sending user in aliases