I have been getting a lot of "Delayed Mail" from the Mail Delivery System overnight. (2-3 April)
The headers look like this (redacting my email address)
Reporting-MTA: dns; omega.meteoplug.com
X-Postfix-Queue-ID: 7E8F321527
X-Postfix-Sender: rfc822; xxxx@xxxxx.net
Arrival-Date: Fri, 3 Apr 2020 14:11:18 +0200 (CEST)
Final-Recipient: rfc822; borgervejr@dmi.dk
Original-Recipient: rfc822;borgervejr@dmi.dk
Action: delayed
Status: 4.7.500
Remote-MTA: dns; dmi-dk.mail.protection.outlook.com
Diagnostic-Code: smtp; 451 4.7.500 Server busy. Please try again later from
[85.158.5.229]. (AS77719205)
[AM5EUR02FT044.eop-EUR02.prod.protection.outlook.com]
Will-Retry-Until: Wed, 8 Apr 2020 14:11:18 +0200 (CEST)
Greg Hamel
Delayed Mail messages
Moderator: Mattk