Thanks I’ll check it out. The bounce link was to an office 365 spam delist portal. My request was auromatically rejected and my only option was to escalate it to support (one click luckily). I’m yet to hear back, but from the stories on the link I shared, I doubt it will do anything.

Wow that is a wonderful link, they really seem to be improving on interacting with the public in these matters.

The link used to be <https://postmaster.live.com/snds/index.aspx>, and has existed since at least 2018.