resomta-c2p-555920.sys.comcast.net resomta-c2p-555920.sys.comcast.net ESMT

I have been using Outlook to manage my Comcast email account for about 15 years. Starting yesterday I could receive email but not send. I also use Thunderbird for my Quickbooks account and can't send emails there too. If I log in to xfinity through a browser I can send without problems. I tried creating a new account tab in Outlook but it won't pass the test phase when sending.

Any Ideas?