We have no way to help you on this. The reason is only known by MS itself. If I was you, I will check the following stuff on my end,
1. sender IP reputation (listed in any RBL?) 2. sender IP reverse DNS and hostname 3. sender IP action (any bulk sending?) 4. helo hostname 5. message body (any sensitive keywords?) and header (deformed header?) 6. SPF, dkim and dmarc settings 7. smtp dane (if have) if all got nothing then I will contact MS support directly. Thanks. > > 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 > > _______________________________________________ > > Postfix-users mailing list -- postfix-users@postfix.org > > To unsubscribe send an email to postfix-users-le...@postfix.org > _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
