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SMTP sever not reachable for outgoing mail as of March 1st.

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SMTP sever not reachable for outgoing mail as of March 1st.

As of about 4:30pm, my Mac Mail on High Sierra cannot reach the SMTP server at Comcast.  I haven't changed the settings in over 3 years.   Any suggestions?

 

ComcastSMTP.jpg

 

 

ComcastSMTP.jpg