I'm not saying that you are wrong to do what you do, just that I and many others consider the banned extensions a first line of defense for brand new viruses, and it is definitely necessary for good virus protection and causes no problems unless you are blocking more common extensions (like .exe).  All files that flunk the banned extensions test also get put into hold on the server, though I would prefer to be able to turn that off. 
 
I am blocking exe and dll.
And if i forward a banned file i know which file to forward. But i have to be sure that there is not also a virus in that file additional to the file i bann. Of course this is limited to the viruses that are known at this time.
 
Hermann

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