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When projects are exported and sent by mail, the MIME Content-Type is application/octet-stream Since it's a ZIP-file the correct MIME-type is application/zip
I'll take a look at it.
Unfortunately I can't fix it easily. Ant doesn't seem to have a configuration parameter for mime types of attachments sent by mail task: http://ant.apache.org/manual/CoreTasks/mail.html The solution would be to rewrite the module not to use the ant task but to use javamail library instead. I don't think it's worth the effort right now.