if people send mails with attachments, which have filenames containing non-ASCII-characters, the file extension filter doesn't work! So all you have to do to trick the file extension filter, is to send an attachment named "Männermagazin.exe" (German word for "magazine for adult males" [;)] ). That mail will not be filtered, even if the Astaro-admin defines a filter for *.exe-files.
Have fun,
thtran.
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