Postfix™ logs its information with syslog. No special configuration is necessary.
Example 9.4. Postfix™ Log Sample
Dec 1 04:02:56 internetsrv postfix/pickup[20919]: 693A3578E: uid=0 from=<root> Dec 1 04:02:56 internetsrv postfix/cleanup[20921]: 693A3578E: \ message-id=<john.doe.1@example.com> Dec 1 04:02:57 internetsrv postfix/qmgr[20164]: 693A3578E: \ from=<john.doe.2@example.com>, size=617 (queue active) Dec 1 04:02:57 internetsrv postfix/cleanup[20921]: E325C578D: \ message-id=<john.doe.1@example.com> Dec 1 04:02:58 internetsrv postfix/local[20924]: 693A3578E: \ to=<john.doe.2@example.com>, relay=local, delay=3, \ status=sent (forwarded as E325C578D) Dec 1 04:02:58 internetsrv postfix/qmgr[20164]: E325C578D: \ from=<john.doe.2@example.com>, size=769 (queue active)