I just tried a couple of things...
When I send a file with the exact same file name that is giving me problems when received from someone else, it works flawlessly.
However, when I look at the mail source, I see that the UTF-8 encoding of the attachment's file name is different in the mail sent through Runbox and the one from a third-party mail account.
Please let me know if the sample forwarded by janusz is sufficient for you to investigate the matter. Otherwise I can provide more info via direct mail.
Best regards,
gecko
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