How can I reset my password of email authentication?

I can not send e-mails with e mac mail App I have error message 'Cannot send message using the server smtp.comcast.net' error message also shows that account offline. When I enter my password for my account from comcast I get message that cannot verify the password. I tried all the passwords that I can remember and no check. So, how to reset the password for authentication?

That would be a question to a forum of support of Comcast, help document or help desk support.

Tags: Mac OS & System Software

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