patch to mcom to make using msmtp easier w/multiple identities

[attila <attila@stalphonsos.com>]

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Hi fellow mblazers,

Attached is a patch to mcom from mblaze 0.5.1 that I use to get
msmtp to properly decide which SMTP server to use based on the From
address.  Am not particularly attached to this way of doing things,
this is just what's working for me now.  To use it, I put

    sendmail: /usr/local/bin/msmtp
    auto-from: -f

in my ~/.mblaze/profile and set the From address to match the "from"
directives in each stanza of my msmtp config.

Pax, -A

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--- /usr/local/bin/mcom	Tue Oct  2 15:38:41 2018
+++ /home/attila/bin/mcom	Sat Apr 27 10:44:44 2019
@@ -73,6 +73,7 @@ sendmail=$(mhdr -h sendmail "$MBLAZE/profile")
 sendmail_args=$(mhdr -h sendmail-args "$MBLAZE/profile")
 sendmail="${sendmail:-sendmail} ${sendmail_args:--t}"
 default_from=$(mhdr -h local-mailbox "$MBLAZE/profile")
+auto_from=$(mhdr -h auto-from "$MBLAZE/profile")
 
 hdrs=
 resume=
@@ -351,6 +352,10 @@ while :; do
 			sendmail="${sendmail:-sendmail} -- $resent"
 			;;
 		esac
+		if [ -n "$auto_from" ]; then
+			from="$(echo $draft | maddr -a -h from)"
+			sendmail="${sendmail} ${auto_from} ${from}"
+		fi
 
 		if [ -e $draftmime ]; then
 			if [ $draft -ot $draftmime ] || [ "$automime" -eq 1 ]; then