๐
Logging subjects
Add a header check with a WARN
disposition for subjects.
Edit /etc/postfix/header_checks
. Add:
/^([Ss]ubject):/ WARN
Then update the database, postmap /etc/postfix/header_checks
. Subjects will be logged by the cleanup daemon in /var/log/maillog
.
Jan 8 12:06:35 jib postfix/cleanup[9584]: D833F2C1C5E: warning: header Subject: Earn a $25 statement credit after you spend $500 or more from mta3.member.americanexpress.com[136.147.130.158]; from=<bounce-21_HTML-62395388-1626587-7201782-591@bounce.member.americanexpress.com> to=<user@foo.com> proto=ESMTP helo=<mta3.member.americanexpress.com>