Ok, another test ...
First: thanks for your replies, this behavior by Calibre is very strange.
Here are results from a test i did a few minutes ago.
My daughters computer had no epub-reader software installed. For test proposes i installed the fb-reader (because i also have Adobe DR installed on my computer).
I sendes 3 books. 1 was ok (attachment, name and book matching)
The other 2 were mixed.
So i really think the error is on my computer.
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