add mbnc to bounce messages

GNUmakefile

@@ -60,6 +60,7 @@ install: FRC all
 	install -m0755 $(ALL) $(SCRIPT) $(DESTDIR)$(BINDIR)
 	ln -sf mless $(DESTDIR)$(BINDIR)/mnext
 	ln -sf mless $(DESTDIR)$(BINDIR)/mprev
+	ln -sf mcom $(DESTDIR)$(BINDIR)/mbnc
 	ln -sf mcom $(DESTDIR)$(BINDIR)/mfwd
 	ln -sf mcom $(DESTDIR)$(BINDIR)/mrep
 	install -m0644 man/*.1 $(DESTDIR)$(MANDIR)/man1

README

@@ -13,6 +13,7 @@ DESCRIPTION
      mblaze consists of these Unix tools that each do one job:
      maddr(1)     extract addresses from mail
      magrep(1)    find mails matching a pattern
+     mbnc(1)      bounces mail
      mcom(1)      compose and send mail
      mdeliver(1)  deliver messages or import mailboxes
      mdirs(1)     find Maildir folders
@@ -126,6 +127,6 @@ LICENSE
      To the extent possible under law, the creator of this work has waived all
      copyright and related or neighboring rights to this work.
 
-     http://creativecommons.org/publicdomain/zero/1.0/
+           http://creativecommons.org/publicdomain/zero/1.0/
 
-Void Linux                       June 30, 2017                      Void Linux
+Void Linux                      January 6, 2018                     Void Linux

man/mblaze.7

@@ -1,4 +1,4 @@
-.Dd June 30, 2017
+.Dd January 6, 2018
 .Dt MBLAZE 7
 .Os
 .Sh NAME
@@ -20,6 +20,8 @@ consists of these Unix tools that each do one job:
 extract addresses from mail
 .It Xr magrep 1
 find mails matching a pattern
+.It Xr mbnc 1
+bounces mail
 .It Xr mcom 1
 compose and send mail
 .It Xr mdeliver 1

man/mbnc.1

@@ -0,0 +1 @@
+.so man1/mcom.1

man/mcom.1

@@ -1,11 +1,12 @@
-.Dd July 22, 2016
+.Dd January 6, 2017
 .Dt MCOM 1
 .Os
 .Sh NAME
 .Nm mcom ,
 .Nm mfwd ,
+.Nm mbnc ,
 .Nm mrep
-.Nd compose, forward, reply to, and send mail
+.Nd compose, forward, bounce, reply to, and send mail
 .Sh SYNOPSIS
 .Nm mcom
 .Op Ar recipients\ ...
@@ -14,6 +15,8 @@
 .Nm mfwd
 .Op Fl r
 .Op Ar msgs\ ...
+.Nm mbnc
+.Ar msg
 .Nm mrep
 .Ar msg
 .Sh DESCRIPTION
@@ -40,6 +43,15 @@ to forward as
 .Xr mshow 1
 rendered plain text, using RFC934 message encapsulation.
 .Pp
+.Nm mbnc
+behaves like
+.Nm mcom
+but creates the draft from the original
+.Ar msg
+(including headers)
+and adds a Resent-To header, to which the message will
+be bounced directly.
+.Pp
 .Nm mrep
 behaves like
 .Nm mcom

mbnc

@@ -0,0 +1 @@
+mcom

mcom

@@ -143,6 +143,14 @@ fi
 			done
 		) fi
 		;;
+	*mbnc*)
+		printf '%s: \n' Resent-To
+		from=$(mhdr -h local-mailbox "$MBLAZE/profile")
+		[ "$from" ] && printf 'Resent-From: %s\n' "$from"
+		msgid | sed 's/^/Resent-/'
+		printf 'Resent-Date: %s\n' "$(mdate)"
+		mseq "${@:-.}" | xargs -d'\n' cat
+		;;
 	*mrep*)
 		[ "$#" -eq 0 ] && set -- .
 		ng=$(mhdr -h newsgroups "$1")
@@ -178,16 +186,20 @@ fi
 		;;
 	esac
 
-	if [ -f "$MBLAZE/signature" ]; then
-		SIGNATURE="$MBLAZE/signature"
-	elif [ -f ~/.signature ]; then
-		SIGNATURE="$HOME/.signature"
-	fi
+	case "$0" in
+	*mbnc*) ;;
+	*)
+		if [ -f "$MBLAZE/signature" ]; then
+			SIGNATURE="$MBLAZE/signature"
+		elif [ -f ~/.signature ]; then
+			SIGNATURE="$HOME/.signature"
+		fi
 
-	if [ -n "$SIGNATURE" ]; then
-		printf '%s\n' '-- '
-		cat "$SIGNATURE"
-	fi
+		if [ -n "$SIGNATURE" ]; then
+			printf '%s\n' '-- '
+			cat "$SIGNATURE"
+		fi
+	esac
 } >$draft
 
 automime=
@@ -200,6 +212,14 @@ while :; do
 			*.*) sendmail="mblow";;
 		esac
 
+		resent="$(maddr -h resent-to "$draft")"
+		case "$resent" in
+		?*)
+			sendmail=$(mhdr -h sendmail "$MBLAZE/profile")
+			sendmail="${sendmail:-sendmail} -- $resent"
+			;;
+		esac
+
 		if [ -e $draftmime ]; then
 			if [ $draft -ot $draftmime ] || [ "$automime" -eq 1 ]; then
 				stampdate $draftmime