[Evi]

I had the same problem, as soon as I had an umlaut in the subject, the entire email was coded incorrectly (took me 2 hours to figure this out 😀 )

I was able to solve the problem by switching from wp smtp pro to the free version. Apparently the said tracking of emails (email protocols) is not activated because this is a paid function.

hope this helps 🙂

[Author]

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