I have a number of email accounts that I can't access with apple mail as ATT, SBC global. says you are third party app.

Many eMail providers now require a separate App Password different from your eMail password…

Then you may need Ways to securely access AOL Mail…

https://help.aol.com/articles/allow-apps-that-use-less-secure-sign-in

Or it may just need an App Password...

https://support.google.com/mail/answer/185833?hl=en-GB

Yahoo has gone to this too...

https://help.yahoo.com/kb/access-yahoo-mail-third-party-apps-sln15241.html

Yahoo App password…

Generate and manage third-party app passwords

Some older, third-party email apps (that do not use our Yahoo branded sign in page) require you to enter a single password for login credentials. To access your Yahoo Mail account on these apps, you'll need to generate and use an app password. An app password is a long, randomly generated code that gives a non-Yahoo app permission to access your Yahoo account. You’ll only need to provide this code once to sign in to your third-party email app.

https://help.yahoo.com/kb/access-yahoo-mail-third-party-apps-sln15241.html

Using app passwords with apps that don't support two-step verification (microsoft.com)

thanks for the links. i got this notification from AOL (the "provider" for Verizon FIOS email. of note, one option is to delete the account and then relink it - but it will delete all email - would help if they gave a heads up on that as one is deciding which approach to take. I'm going to try the app password approach - i don't want to lose all the emails-i hhave to do the same on my MAC and that would be a lot of emails lost and organized into topic specific folders

Beenicetome wrote:

What do I need to do to access email accounts with apple mail app?

Contact Att support.