Update on the E-Mail fetching problem from earlier (in case other people face the same issue):
I did as you said (marked one E-Mail at a time as unread) and was able to fetch all emails like this. I don't know what exactly was the problem because ALL emails worked if fetched individually, so I don't know if one of them made problems for the other ones.
I also now remove them from the fetching folder as soon as the fetching was successful to hopefully avoid this problem in the future.
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