diff --git a/share/man/man5/periodic.conf.5 b/share/man/man5/periodic.conf.5
index e236f97dcbd4..df394b65192c 100644
--- a/share/man/man5/periodic.conf.5
+++ b/share/man/man5/periodic.conf.5
@@ -405,6 +405,8 @@ on the submit mail queue when
 .Va daily_status_mailq_enable
 is set to
 .Dq YES .
+This may not work with MTAs other than
+.Xr sendmail 8 .
 .It Va daily_status_security_enable
 .Pq Vt bool
 Set to
diff --git a/usr.sbin/mailwrapper/mailwrapper.8 b/usr.sbin/mailwrapper/mailwrapper.8
index 1e8c73d801ce..9efd6a749edb 100644
--- a/usr.sbin/mailwrapper/mailwrapper.8
+++ b/usr.sbin/mailwrapper/mailwrapper.8
@@ -112,6 +112,16 @@ based on configuration information placed in
 .Pa /etc/mail/mailer.conf .
 This permits the administrator to configure which MTA is to be invoked on
 the system at run time.
+.Pp
+Other configuration files may need to be altered when replacing
+.Xr sendmail 8 .
+For example, if the replacement MTA doesn't support the
+.Fl A
+option with
+.Xr mailq 1 ,
+.Va daily_status_include_submit_mailq
+should be turned off in
+.Pa /etc/periodic.conf .
 .Sh FILES
 Configuration for
 .Nm
@@ -134,6 +144,7 @@ was invoked.
 .Xr mailq 1 ,
 .Xr newaliases 1 ,
 .Xr mailer.conf 5 ,
+.Xr periodic.conf 5 ,
 .Xr sendmail 8
 .Sh HISTORY
 The