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  2. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    If your third-party email app is having issues connecting, sending, or receiving emails, you may need to reconfigure your account or update the app. Use these steps to identify and fix the source of the problem.

  3. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    535 5.7.8 Authentication credentials invalid [3] 538 5.7.11 Encryption required for requested authentication mechanism [3] 550 Requested action not taken: mailbox unavailable (e.g., mailbox not found, no access, or command rejected for policy reasons) 551 User not local; please try <forward-path> 552 Requested mail action aborted: exceeded ...

  4. Fix problems sending AOL Mail

    help.aol.com/articles/aol-mail-troubleshooting

    Once you've secured your account and changed your password, it should help to resolve the additional issues with your account. Fix problems with being unable to send email If you're having problems sending mail, there are a few troubleshooting steps you can take to fix the problem.

  5. Fix problems with third-party mail applications - AOL Help

    help.aol.com/articles/why-cant-i-access-my-aol...

    Find your application's "Email Accounts" or "Account Settings" section, select your AOL Mail account, then update to your new password. If you've activated 2-step verification for your AOL account, you'll need to generate and use an "app password" to access AOL Mail from these apps.

  6. Reauthenticate your AOL Mail account in third-party email ...

    help.aol.com/articles/reauthenticate-your-aol...

    On the IMAP/SMTP server overlay, enter your AOL Mail password in the Password field. If you use an app password to sign in to your AOL Mail account with the email application , you may need to delete your current app password, generate a new one, and use the new app password to sign in. App passwords are managed from your AOL account security page.

  7. SMTP Authentication - Wikipedia

    en.wikipedia.org/wiki/SMTP_Authentication

    SMTP Authentication, often abbreviated SMTP AUTH, is an extension of the Simple Mail Transfer Protocol (SMTP) whereby a client may log in using any authentication mechanism supported by the server. It is mainly used by submission servers, where authentication is mandatory.

  8. Bounce message - Wikipedia

    en.wikipedia.org/wiki/Bounce_message

    Although the SMTP is a mature technology, counting more than thirty years, its architecture is increasingly strained by both normal and unsolicited load. [2] The email systems have been enhanced with reputation systems tied to the actual sender of the email, with the idea of recipient's email servers rejecting the email when a forged sender is used in the protocol.

  9. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    help.aol.com/articles/how-do-i-use-other-email...

    Settings may be in a different location in each email client, though the AOL server and port settings will always be the same. For additional questions specific to the email client, check the manufacturer’s website. Manufacturers cannot answer questions about your AOL Mail settings, or your AOL username or password.