Since el capitan installation on my imac, I cannot delete messages in my apple email. I also cannot send messages. I keep getting: Can’t connect to the account “smtp.comcast.net”> Enter the password for user “”. Unable to verify account name or password. I have tried entering my service provider password and that doesn't work. I have created a new apple id password and that doesn't work. Saved Drafts no longer show up. Do I have to have an icloud account? Can I delete this whole section? I am a computer simpleton. I want my apple email back and have spent fruitless hours trying to get it back.