Suddenly, actually for the second time in a week, I am not receiving emails via my Apple mail function. I get a message that the mail server "mail.comcast.net" is not responding. I've been through the account settings, I know my password and have rented and entered it to no avail. I use the same password and can successfully sign in to my Xfinity account. I can get emails on my iPhone when in cellular mode. Condition just appeared, sometime over night.