Email problems smtp

@Again​ I am able to login to my account through a browser to send and receive email, but this much more cumbersome. I’d prefer to go back to accessing through my iPhone mail app, which is much more convenient. 

@XfinityAlex​ I’m not sure what you mean by ‘not correct’. This is the exact error I am receiving. Email has worked fine for years, but I recently started receiving the error. 

@JPTurkey​ Neither your email address or your login should be  " [Edited: "Personal Information"]cast.net", they should be [Edited: "Personal Information"].  If you correct that, the issue may go away.

@XfinityAlex​ I'm going to volunteer my specifications below for fixing this issue for the Mail app on Mac. After struggling with this issue for about 4 hours, regrettably the information out here in the various support threads is partially complete and the security change was not well communicated by Comcast. Your specification of "take the @comcast.net off" above IS necessary to get this to work.Here are the specifications for the settings:

- EACH email account using the third party app (Mail on Mac, in this case) needs a separate outgoing SMTP server created, and specified in the Preferences / Server settings.

- the user name in the SMTP server is the relevant Comcast account name / email address without the @comcast.net.

- the password is what it is for that email account

- for my wife's email account, it was mandatory to

1. UNcheck "automatically manage connection settings"
2. fill in 587 in the Port and check Use TLS/SSL (it may have defaulted to that)
3. Choose "Password" in the Authentication dropdown

- note that I did NOT have to do that setting for my email account, the "primary" one on the account.