Mail is going directly to Trash!

Mail is going directly to Trash!

When I am checking my mail on the computer, my mail is going directly to the Trash.  It started three weeks ago when I noticed that 1 or 2 pieces of new mail were showing up in my Trash, but the vast majority of my mail went to the Inbox.  That ratio gradually changed, and now - three weeks later - all of my received mail is going directly to Trash.  Well ... sort of "directly".

If my Inbox is open (computer), and I am looking at it when mail arrives, the new mail flashes into my box and within 1/2 a second is moved to Trash.  When on my phone - using the Zoho Mail App - there simply isn't any new mail. 

What is going on??  Do I have a virus or something?