If you want to log the Subject during the SMTP delivery (will appear as <timestamp> <hostname> postfix/smtp log):
main.cf: smtp_header_checks = pcre:/etc/postfix/header_smtp.pcre header_smtp.pcre: /^Subject: / info From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of Olivier CALVANO Sent: Sunday, April 19, 2015 11:18 AM To: phil Cc: postfix-users Subject: Re: Add subject in logs or into a file ? Thanks i test today ;=) 2015-04-19 7:27 GMT+02:00 phil <p...@philfixit.info>: On 19/04/2015 3:21 PM, Olivier CALVANO wrote: Hi Actually, i have a Postfix server and into the logs i have: Apr 14 20:06:00 mx postfix/smtpd[24600]: 01BF8301079A: client=o1.email.xx.com <http://o1.email.xx.com>[192.xx.xx.153] Apr 14 20:06:00 mx postfix/cleanup[24932]: 01BF8301079A: message-id=<14cb9189909.2c84.ab5ac@ismtpd-061> Apr 14 20:06:00 mx postfix/qmgr[20732]: 01BF8301079A: from=<bounces+701539-9339-xx=xx...@email.xx.com <mailto:xx...@email.xx.com>>, size=18397, nrcpt=1 (queue active) Apr 14 20:06:01 mx postfix/smtp[24933]: 01BF8301079A: to=<myu...@xx.fr <mailto:myu...@xx.fr>>, relay=spam.mydomain.org <http://spam.mydomain.org>[2a02:xx:xx:X:X::400]:25, delay=1.5, delays=0.92/0.04/0.16/0.34, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as BDE043004F53) Apr 14 20:06:01 mx postfix/qmgr[20732]: 01BF8301079A: removed I am search a solution for put into the logs the subject of the mail. Directly into the logs, sample: Apr 14 20:06:01 mx postfix/smtp[24933]: 01BF8301079A: subject=test logs subject or into a separate file, sample: 01BF8301079A;test logs subject; it's possible ? regards Olivier You can do a header check with a regexp in main.cf . . . header_checks = regexp:/etc/postfix/header_checks and in that file put something like . . . /^Subject: / WARN regards phil