Hi,

I regularly get PDF attachments from my accountant and they are corrupt. It seems to be caused by Zoho Mail (if my accountant CC's the email to another address the attachment sent to my Zoho address gets corrupted, but the attachment sent to the cc'ed address is fine). 

Are there steps recommended to fix this? I can see that Zoho Mail uses Clam AV to scan mail for viruses. I suspect this is the cause (I have seen the same thing happen with AV scanners and other mail systems). Is it possible to disable Clam AV scanning for a particular sender?