The earlier patch I created was obviously no good. Sorry for the noise. Included is the fixed patch that just adds some text for properly using an mda wrapper in the actions:
Index: smtpd.conf.5 =================================================================== RCS file: /cvs/src/usr.sbin/smtpd/smtpd.conf.5,v retrieving revision 1.199 diff -u -p -u -r1.199 smtpd.conf.5 --- smtpd.conf.5 1 Sep 2018 19:56:28 -0000 1.199 +++ smtpd.conf.5 2 Sep 2018 15:53:57 -0000 @@ -205,6 +205,9 @@ Use the mapping for virtual expansion. The aliasing table format is described in .Xr table 5 . +.It Cm wrapper Ar name +Use the wrapper specified in +.Cm mda wrapper. .El .Pp The relay delivery methods also support additional options:
