Most of the time when users try to send out mails with Powerpoint attachments (.pptx) the mails are being blocked because of file extension ".tmp".
Quarantaine view:
Message view of a blocked mail:
The file was just a regular pptx file, and is mentioned as such in the message view, yet the antivirus recognized it as being a tmp file. Also, I used "most of the time" because when the problem was first mentioned to me, I tried sending a pptx file and that worked, so it's not a flat block of all pptx files. I also asked a user to forward me the mail with attachment (internally) and then tried forwarding this to an external address and it got blocked 4 out of 5 times so 1 actually went through.
Any ideas what might cause this behaviour? Something to do with the contents of the pptx file maybe? But then why doesn't it block 100% of the time for the same file?
Thanks in advance!
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