Outgoing Email Issue on 3rd party apps

I am no longer able to send email using 3rd party app's.  I have the correct box enabled, have reset my password multiple times, deleted and attempted to readd the email back multiple times. It says my outgoing smtp password is incorrect...it is the same as the incoming and I can received email just fine on 3rd party apps.  I have spoken with multiple different people at Comcast today.  Technical support, tier 2 support, csa team. They just keep passing me back and forth with no resolution.