Well I hope you have anti virus scanning of email disabled in NIS permanently. It rarely actually sc

Well I hope you have anti virus scanning of email disabled in NIS permanently. It rarely actually scans mail these days, being unable to scan mail on SSL or TLS secured connections (most of them) or IMAP accounts, also the most common access method.

when an email is send, it is assembled in the temp folder. my guess is NIS is scanning the email there as a file as well as soon as it is created. Given the decades old habit of NIS slowing everything on a computer to a crawl, I suggest you try with a difference virus solution and see if things get better.