Solved. It turns out the outbound server port number was changed. I didn't change it so if my email service provider changed it for some reason they didn't send any message that such a change was being made. Thanks to all for the replies.
Gotta love windows, I've been listing some stuff lately and a buyer said I sent you a response on C/L but you never responded sp he responded to a FB MP posting on the same item.
I later checked and sure enough the response's weren't coming through but they had been 4 weeks earlier. A little googling led me to discover that SOME incoming mail was being directed to an inactive outlook program.
I sure didn't change anything but iI suspect the last update did
