I am testing dkim signing on my Postfix server. I am using the opendkim milter.
For sending mail to other domains, external and not mine, the signing is working okay. But when I test it at the command line using 'sendmail' on the Postfix server, where I am sending to my own domain sendmail -i -f root -t <<DKIMTEST From: d...@mail.example.com To: u...@example.com Subject: test test DKIMTEST I receive the email but it is not DKIM signed. In my logs I have only this May 22 09:07:28 mail postfix/pickup[26683]: 3rD3N05mHTz2xDs: uid=0 from=<root> May 22 09:07:28 mail postfix/cleanup[26971]: 3rD3N05mHTz2xDs: message-id=<3rd3n05mhtz2...@mail.example.com> May 22 09:07:28 mail postfix/qmgr[26682]: 3rD3N05mHTz2xDs: from=<r...@mail.example.com>, size=316, nrcpt=1 (queue active) May 22 09:07:29 mail postfix/relay/smtp[26984]: 3rD3N05mHTz2xDs: to=<u...@example.com>, relay=mail2.example.com[192.168.1.101]:10001, delay=0.62, delays=0.02/0.01/0.36/0.23, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 0CC5A102F2D) May 22 09:07:29 mail postfix/qmgr[26682]: 3rD3N05mHTz2xDs: removed In my master.cf I have this Postfix listener relay unix - - n - - smtp -o syslog_name=postfix/relay -o smtp_bind_address=192.168.1.101 -o smtp_connect_timeout=5 -o smtp_helo_timeout=5 and in the main.cf relay_domains = lmdb:/etc/postfix/relay_transports transport_maps = lmdb:/etc/postfix/relay_transports and /etc/postfix/relay_transports example.com relay-vpn:[mail2.example.com]:10001 ... I think it is the last piece to touch the email before it is delivered? But I dont think I can add this -o smtpd_milters=unix:/var/run/opendkim/opendkim.sock to the relay listener because it is smtp, not smtpd? What can I do to make the self-sent message to my own domain be signed by the milter? I think I just need to understand *where* to put it correctly.
