Feb 24 21:34:41 c postfix/smtpd[7613]: connect from zimbra.example.com[<ip>]
Feb 24 21:34:41 c postfix/smtpd[7613]: NOQUEUE: reject: RCPT from zimbra.example.com[<ip>]: 554 5.7.1 <jack.sparrow@mydomain.com>: Relay access denied; from=<kyle.king@example.com> to=<jack.sparrow@mydomain.com> proto=ESMTP helo=<zimbra.example.com>
Feb 24 21:34:41 c postfix/smtpd[7613]: disconnect from zimbra.example.com[<ip>]
Feb 24 21:36:01 c postfix/master[7606]: terminating on signal 15
Feb 24 21:36:01 c postfix/master[7772]: daemon started -- version 2.8.5, configuration /etc/postfix