IMAIL for el capitan cannot send e-mail

I use MacBook pro OS x el capitan 10.11.5 Imail for my comcast account worked fine up until yesterday. Nothing has changed in the settings. I used all suggestions from apple support, but I can't send email. Account information are gray and I can't change. The port has been I think of 587 smpt.comcast.net address. Help, please.

Thank you. Marilyn

If you cannot send or receive e-mail on your Mac - Apple Support

Tags: Mac OS & System Software

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