New password won't work in Apple mail (ios and macos)

Hello @tlynch44, we're happy to help with signing in to your email on your IOS and Mac.

Use these steps to set up your email for the first time or on a new computer. First clear your cache and cookes and then follow these steps: 

1. From Mail, select Mail > Preferences.
2. Choose Accounts and then select the + (plus sign).
3. Select Add Other Mail Account and then Continue.
4. Complete Add a Mail Account info:
   • Full name as you want it to display to others
   • AT&T email address (YourName@att.net)
   • Password – enter your password or secure mail key
5. Select Create. The account will automatically configure and appear in the Accounts list.
6. Close the Preferences window to begin using your email account.

Already have your email set up, but want to update your settings or add your secure mail key? Here’s what you have to do:

1. Select Preferences > Account Information.
2. Choose your mail account.
3. Select POP3 or IMAP.
4. Confirm User name.
5. Enter your password or secure mail key.
6. Confirm or enter the following settings:
   • Incoming Mail Server - inbound.att.net (POP3) or imap.mail.att.net (IMAP) 
   • Outgoing Mail Server - outbound.att.net (POP3) or smtp.mail.att.net (IMAP) 
7. In Outgoing Mail Server (SMTP), choose Edit SMTP Server List.
8. Confirm:
   • Server Name - outbound.att.net or smtp.mail.att.net.
   • Use default ports - 25, 465.
   • Use Secure Sockets Layer (SSL) is selected.
9. Select OK. 
10. On Advanced tab, confirm:
    • SSL checkbox is selected.
    • Authentication field is set for Password.
11. Close window.

Use these guided steps in our Troubleshooting tool to get help setting up or updating your email account. Select Email Setup and Repair and follow the prompts. Meet us back here with the results if you have any questions. Thank you for reaching out to AT&T Community Forums.

Alasani, AT&T Community Specialist 

Thank you Alasani.  Your response got me to the correct answer which is that I had to create and use a Secure Mail Key.  A Password won't work anymore.

Tony

We are happy that our information was able to help you regain access to your email, @tlynch44.

Please reach back out if you need any additional assistance.

Thank you for choosing AT&T Community Forums.

Latoya, AT&T Community Specialist