Q: mail just stopped connecting yesterday morning.  It was up and connected and then just stopped.  I have deleted yahoo and iCloud accounts and added them again.  i can sign in directly to yahoo and iCloud but Mail will not connect.  any advice?

MacMail stopped connecting yesterday morning.  It was up and running and then failed and I have not been able to connect to yahoomail or icloud since. i have internet connectivity and can sign on to both yahoomail and icloud thru Safari.  I have deleted the mail accounts and readded.  still cannot connect.  Any advice?