Mail problems with newly introduced incoming mail server

A new receiving mailserver was introduced July 1. This server has the most recent version of Ubuntu and other software and settings that are more conforming to the directives (in Dutch). After the introduction, problems appeared with receiving mail from Microsoft Office 365 Exchange Online (mail.protection.outlook.com). An even bigger problem was that some accepted mails were not forwarded, but bounced to the sender. Because that problem couldn’t be fixed immediately, the newly introduced server has been shut down on July 2. At the end of August, C&CZ will test the probable solution. If the test succeeds, the new incoming server will be put into production.