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I just ran the test and the email was like a normal email.
Also want to mention it is not every email from the group they have an issue with but a certain type of email I post daily. See below what the email is like.
Others get it OK thru Groups.io is OK.

Unless if you're using copy and paste to create that message and some formatting code or something gets inadvertently included and is causing the problem, I don't know.?

Either way, you may want to consider sending the email as a PDF attachment instead of including everything in the email itself, that's one very long email.? Plus a PDF would guarantee it looks the same to all recipients.

Cheers,
Christos