gmail.com and the other historical/incubator domains (gmx.de, gridfactor.de,
rpf.de, viscreation.de, wheregroup.com) were in /etc/postfix/vhost, so mail to
those addresses short-circuited into the local incubator archive via dovecot
lmtp and never left the host — e.g. a campaign test from info@produktor.io to
eslider@gmail.com. DMS appends postfix-main.cf last, so this override wins.
Dovecot accounts stay for IMAP/doveadm import; only local delivery changes.
Verified: v19 EML relayed to gmail-smtp-in.l.google.com, status=sent, dkim=pass.
