Michael Brunnbauer writes:

So let's look at one example from Paypal. It contains a Feedback-ID header
that ends with 0xa0 - a non breaking space. I guess that's an oversight from
Paypal that would cause no issues with a version of Outlook that supports
POP3 with UTF-8. Am I correct? From the headers I can see that my customer
uses Microsoft Outlook 15.0. Would version 16 fix that?

0xa0 is ISO-8859-1, not even UTF-8. In UTF-8, the non-breaking space is multibyte sequence 0xc2 0xa0.

What do I tell my customer now? That Paypal got it wrong or that he should
upgrade to Outlook 16? God this is fun. I love to be anal about such things!

Well, Paypal got it wrong. This is an established fact. Everything else is debatable.

A Google search for "rfc "6855" site:microsoft.com" finds nothing. That's not definitive, it's possible that this is implemented in the current Outlook, but I don't think it's likely.

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