I have sbcglobal.net email. Two days ago my email would not load. Discovered if I turn avast off the email works just fine. I am up-to-date with avast and have not changed anything
are you using webmail? … If not, what mail client?
I’m not using outlook, so I guess web mail.
You guess… 
That is like saying :
I have a car, but I don’t know what make, model, color…
How/with what do you check your mail ?
Is sbcglobal.net your ISP?
I have att uverse and check it thru chrome