Hello everyone,
We are currently experiencing a problem with the delivery of emails to Microsoft 365 Mail Server.
We receive the following error message when delivering emails:
The PMG version we are using is 8.1.2 with the latest patch level. It looks to me that Microsoft 365 recognizes the Proxmox as an outdated Exchange Server and therefore does not send the mail through. Behind our PMG we have a Linux postfix mailserver with the mail accounts (Plesk).
Does anyone have similar problems and possibly a solution?
Thank you very much
We are currently experiencing a problem with the delivery of emails to Microsoft 365 Mail Server.
We receive the following error message when delivering emails:
Code:
BE1PEPF0000056C.mail.protection.outlook.com has rejected your message to the following e-mail addresses.
rxxxxxg@hxxxxxr.de
The message was not delivered because it was rejected by the recipient's email provider.
BE1PEPF0000056C.mail.protection.outlook.com
Remote Server returned '550 5.7.230 Connecting Exchange server version is out-of-date; connection to Exchange Online blocked for 60 mins/hr. For more information see https://aka.ms/ExchangeBuildCompliance. [BE1PEPF0000056C.DEUP281.PROD.OUTLOOK.COM 2024-08-14T08:42:45.279Z 08DCBAB9122C091D]'The PMG version we are using is 8.1.2 with the latest patch level. It looks to me that Microsoft 365 recognizes the Proxmox as an outdated Exchange Server and therefore does not send the mail through. Behind our PMG we have a Linux postfix mailserver with the mail accounts (Plesk).
Does anyone have similar problems and possibly a solution?
Thank you very much