Heho, I just gave https://github.com/Snawoot/postfix-mta-sts-resolver a try, and it works as expected for me. The only mails getting delivered are those for the test-cases where at least one MX is valid; And in those cases the mail flows through the lower-prio MX with the valid cert.
So, if you still see some other mails delivered, something might be different on mailcow. Giving that a shot now. With best regards, Tobias -----Original Message----- From: mailop <[email protected]> On Behalf Of Tobias Fiebig via mailop Sent: Tuesday, 9 August 2022 20:37 To: [email protected] Subject: Re: [mailop] Debugging MTA-STS sending Heho, Ok, at least something that works. :-| I am currently setting up a host to implement the postfix lib you shared earlier; Let's see what falls out of that. With best regards, Tobias -----Original Message----- From: mailop <[email protected]> On Behalf Of Eric Tykwinski via mailop Sent: Tuesday, 9 August 2022 20:24 To: [email protected] Subject: Re: [mailop] Debugging MTA-STS sending Tobias, No starttls definitely works for me at least: MailCow with postfix-mta-sts-resolver. ______________________________________________ This is the mail system at host mail.virtcolo.com. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to postmaster. If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <measurem...@mail-mtasts-n-plain.measurement.email-security-scans.org>: TLS is required, but was not offered by host plaintext.measurement.email-security-scans.org[195.191.197.83] ______________________________________________ Sincerely, Eric Tykwinski TrueNet, Inc. P: 610-429-8300 _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
