Aug  1 17:28:07 mail postfix/submission/smtpd[359]: connect from dev.example.com[78.46.xx.xx]
Aug  1 17:28:07 mail postfix/submission/smtpd[359]: NOQUEUE: reject: RCPT from dev.example.com78.46.xx.xx]: 554 5.7.1 <dev.example.com[78.46.xx.xx]>: Client host rejected: Access denied; from=<robot@example.com> to=<stefan@example.com> proto=ESMTP helo=<localhost.localdomain>
Aug  1 17:28:07 mail postfix/submission/smtpd[359]: warning: non-SMTP command from dev.example.com[78.46.xx.xx]: Date: Thu Aug  1 17:28:07 2019
Aug  1 17:28:07 mail postfix/submission/smtpd[359]: disconnect from dev.example.com[78.46.xx.xx] ehlo=2 starttls=1 mail=1 rcpt=0/1 data=0/1 unknown=0/1 commands=4/7