I'm following along the docs http://www.postfix.org/MULTI_INSTANCE_README.html
configuring the 1st piece of multi-instance setup, the NULL CLIENT I installed postfix postconf -d | grep ^mail_version mail_version = 2.10.2 and did this cat /usr/local/etc/postfix/main.cf mail_owner = postfix setgid_group = maildrop myhostname = mail-new.artemis.lan mydomain = artemis.lan myorigin = $mydomain master_service_disable = inet mydestination = local_transport = error:5.1.1 local delivery is disabled alias_database = alias_maps = local_recipient_maps = relayhost = [mail.artemis.lan] default_database_type = cdb indexed = ${default_database_type}:${config_directory}/ inet_interfaces = loopback-only smtp_generic_maps = ${indexed}generic virtual_alias_maps = ${indexed}virtual cat /usr/local/etc/postfix/generic root hostmaster+root=mta1 cat /usr/local/etc/postfix/virtual root hostmaster postmaster root cat /usr/local/etc/postfix/Makefile MTAADMIN=hostmaster all: virtual.cdb generic.cdb generic: Makefile @echo Creating $@ @rm -f $@.tmp @printf '%s\t%s+root=%s\n' root $MTAADMIN `uname -n` > $@.tmp @mv $@.tmp generic %.cdb: % postmap cdb:$< Then I cd /usr/local/etc/postfix make systemctl restart postfix.service I notice here that 'generic' has been changed by the Make to cat virtual root hostmaster postmaster root cat generic root TAADMIN+root=mail-new <===================== ??? and when I test sendmail -i -f root -t <<EOF From: root To: root Subject: test testing EOF mail IS sent from this box, and IS received at the other server. But on the receiving end, the "Return-Path", "From" & "TO" headers are: Return-Path: TAADMIN+root=mail-...@artemis.lan From: TAADMIN+root=mail-...@artemis.lan To: TAADMIN+root=mail-...@artemis.lan which just looks ... odd :-/ The "M" in "MTAADMIN" is missing, the To: should be hostmaster..., ... My GOAL is to have email from this null client sent, and received as, From == root=mail-...@artemis.lan To == hostmaster+mail-...@artemis.lan I suspect that this requires fixes/changes to my Makefile. I haven't figured out its syntax yet, and if I'm doing it right. What's the right config change to get to my specific goal? Arty