in our CRM-System I have to identify every incoming E-Mail by the Message-ID, with that ID I can check if I already have a related E-Mail in the System. Now, it seems that my Postfix Server every time overrides my generated Message-ID. Is there any configuration to prevent the server overriding the Message-ID ?
I tested it with a google Account and the Google Server is not overriding the ID.
By default, Postfix ONLY adds a message-id header when there's none. Without seeing
output it's hard to tell.
There might be a header_checks entry that strips the Message-Id using a regular expression, but one wouldn't usually forget such a thing.