This may depend on how the attachments are encoded by the sender. If you open the message in raw view there should be lines like this immediately preceding each attachment's (presumably also encoded) contents (only separarted by a single blank line from the contents):
Content-Type: image/jpeg; name="image001.jpg"
and/or:
Content-Disposition: inline; filename="image001.jpg"
These ones are obviouly for an image file, but the point here is: If the filenames of your attachments contain non-ASCII characters (which the above ones don't) they need to be converted and indicate what character set is being used for decoding them back to the originally, so what do the only of the message you quoted look like? The character set's name would be shown within the encoded line next to the filename like this:
Content-disposition: attachment; filename="=?UTF-8?Q?=C3=A4=C3=B6=C3=BC.txt?="
In this case the character set is UTF-8 which is the universal one including almost all languages on earth and should be chosen by whatever sender sends attachments and emails using non-ASCII characters.
PS: =C3=A4=C3=B6=C3=BC.txt should be decoded to äöü.txt doing a UTF-8 to West European character decoding ...
This may depend on how the attachments are encoded by the sender. If you open the message in raw view there should be lines like this immediately preceding each attachment's (presumably also encoded) contents (only separarted by a single blank line from the contents):
Content-Type: image/jpeg; name="image001.jpg"
and/or:
Content-Disposition: inline; filename="image001.jpg"
These ones are obviouly for an image file, but the point here is: If the filenames of your attachments contain non-ASCII characters (which the above ones don't) they need to be converted and indicate what character set is being used for decoding them back to the originally, so what do the only of the message you quoted look like? The character set's name would be shown within the encoded line next to the filename like this:
Content-disposition: attachment; filename="=?**UTF-8**?Q?=C3=A4=C3=B6=C3=BC.txt?="
In this case the character set is UTF-8 which is the universal one including almost all languages on earth and should be chosen by whatever sender sends attachments and emails using non-ASCII characters.
PS: =C3=A4=C3=B6=C3=BC.txt should be decoded to äöü.txt doing a UTF-8 to West European character decoding ...
Michael
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