Hi, please advise, tip, directions, whatever. In addition to port 25, I enabled port 587 on the server using this manual: https://www.sbarjatiya.com/notes_wiki/index.php/CentOS_7.x_Enable_submission_587_port_for_postfix When I send a message via port 25, the header contains the DKIM signature. When I send a message over port 587, the header does NOT contain a DKIM signature. How do I please make sure that DKIM is also in messages that I send via port 587? Thank you for the advice.