Hello, I'm currently having the problem that an email cannot be sent to
an Office 365 service from my Postfix.
I only get the following response:
Final-Recipient: rfc822; sen...@domain.com
Original-Recipient: rfc822;sen...@domain.com
Action: failed
Status: 5.4.1
Remote-MTA: dns; sender-domain.mail.protection.outlook.com
Diagnostic-Code: smtp; 550 5.4.1 Recipient address rejected: Access denied.
[CH1PEPF0000AD7B.namprd04.prod.outlook.com 2024-08-10T11:05:28.177Z
08DCB5F2861FDE68]
I checked the sending email account and found no errors
(mxtoolbox,learndmarc.com). All SPF DKIM and DMARC entries are OK. It's
not an e-spam mail either. Of course the recipient is there and the
mailbox is active.
I googled everything and only found indications that some people have
the same problem. I read something about CodeTwo, but that doesn't mean
anything to me and I can't find a solution.
Is this a known problem? Is there a practical solution?
My setup: Debian 12.6, postfix, rspamd, dovecot, all current versions
Thank you for a tip and help
Christian
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