Reset password and secure mail key and can never send email again.

P.S. I just checked, and I can get all the mail I want-- messages sent to me get downloaded into my mail client just fine. It just can no longer send.

P.P.S. I did not modify the settings at all, just the password.

SMTP server:     is still      outbound.att.net

Authentication  is still     basic (never could get OAUTH2 to work)

Port                   is still     465

Secure sockets is still      Always (TLS/SSL)

Mail receive, which still works, is also unchanged, except for the password--

POP server                   inbound.att.net

Authentication             Basic

Port                              995

Secure sockets            Always (TLS/SSL)

Again, all parameters unchanged, except the passwords, which are the same for both sending and receiving.

Hello @a50mhzham! Thank you for reaching out to us! We understand that after you reset your mail password and secure mail key, you're unable to send emails. We hear you, and are happy to assist you.

Please troubleshoot your email account, and settings:

• Check your email size. If your email is too big, it may not be sent.
• Be sure you’re using the correct recipient email address. If not, you may get error messages like Failed Delivery or Problem Found - Message Not Sent.
• Try signing out of your email account and signing back in.
• Check your spam folder for missing emails.

Please try removing the mail client and re-add it. Once you re-add mail client, please add the account details with correct email server settings present in our article about AT&T email server settings.

Also, please let us know which email client you're using to assist you better.

Let us know how it goes!

For further assistance we're here to help.

Thank you for contacting AT&T Community Forums!

Nate, AT&T Community Specialist.

As you can see, there is a specific error message here, and a specific symptom, password lockout for send only. The error message is:

Task: Sending 'Get well soon!'
Status: Not Completed
Details: 5.7.0 (#AUTH005) Too many bad auth attempts. [535]
Time: 4/19/2024 3:10:11 PM

The error is not about message size (besides, the message is a single line, less than 40 characters, with no attachments.

ALSO: This account has a number of subaccounts- about 6 or 7 of them. The server and ports configuration is identical, and all those subaccounts can sign into the same server as the account with the problem, and send and receive email with no problems.

Clearly, this is an ATT / Yahoo Mail problem, not a client configuration problem. Please find me some real help with this issue, and get me connected with a knowledgeable person, someone who can read an error message and work through with me what it means and why it is occurring.  I should be able to open a ticket with ATT and find someone who will be accountable for solving this problem from start to finish, something ATT clearly wants to prevent.

Hi @a50mhzham, thank you for your response. We understand your concern. Let's get the help you need with your email.

After reviewing your concern and trying to resolve through the Community Forums, it looks like you may need more account specific support.  To assist you best, we encourage you to review our Contact Us page (https://www.att.com/support/contact-us/) to identify what method you’d prefer to reach out for this account level help.  You can call, chat, or reach out via social media and we can review your specific issue and provide you support.  We’re sorry we weren’t able to resolve your concern directly in the forums, but let us know if we can assist with anything else.

Thank you for contacting AT&T Community Forums.

Jasmine, AT&T Community Specialist