I'm actually surprised that this post is two hours old and nobody on Lemmy has blamed Google for implementing the required standards or called for OP to host their own mail server themselves on a self hosted European instance.
Jeez, what happened?
this post was submitted on 12 Feb 2026
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TL;DR: Viva.com, one of Europe's largest payment processors, sends verification emails without a Message-ID header — a recommendation of RFC 5322 since 2008. Google Workspace rejects them outright. Viva's support team's response to my detailed bug report: "your account has a verified email, so there's no problem."
I had a company I was doing business with reject a valid email address of mine because it contained a "." character in it. I got an error message about this being invalid email address to use. My "first.last@emailprovider.com" address had no problems sending/receiving emails with anyone else.
There should be some simplified standard way to identify what combination of email configuration is/isn't supported by companies and email providers. This can also future proof against future changes in email configuration changing over time due to the ongoing fight against spam.