Comcast email problems

I somewhat recently out of the blue started having problem sending emails on my phone. I continued to receive emails with no problems. On my laptop am to continue to be able to both send and receive emails. So the problem appears to be localized to my phone email.

After many times of trying to understand the problem and reviewing the outgoing server address was correct and the port was correct. I decided to just delete the email from my phone and set it up again. I successfully set up the comcast email again and downloading all my past emails I thought I had possibly fixed the problem but am now again getting a message that my email is not connecting to the outgoing server.

What can I do?