I have stopped getting any emails from comcast since 18 December 2017. I have tried all the helps listed under "Did your ability to receive mail suddenly stop? Was it working before?"

The only thing I cannot figure out how to try is whether my antivirus is stopping mail from coming. I have the same password at my ISP and I can view the mail at the ISP account. I am using Viper as my antivirus. I have opened it up and selected the email under Manage and the only thing I could see to change was the port being used. I now have the port the same on the Account options and on the Viper email. But still no messages.