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  2. Fix problems sending AOL Mail

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

    If you see an image challenge question when sending mail, you should just be able to complete the challenge then send mail. If, however, you correctly answer the image challenge and still can't send mail, it could be a sign of a more serious issue with your account, which may require additional steps to secure your account.

  3. 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. Troubleshoot any problems with your account

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

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

    If you're having problems accessing AOL Mail through third-party applications, such as Outlook or Thunderbird, try troubleshooting with these suggestions to make sure your email works where and when you need it. Update your password

  5. List of SMTP server return codes - Wikipedia

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

    502 Command not implemented 503 Bad sequence of commands 504 Command parameter is not implemented 504 5.5.4 Unrecognized authentication type [3] 521 Server does not accept mail [5] 523 Encryption Needed [6] 530 5.7.0 Authentication required [3] 534 5.7.9 Authentication mechanism is too weak [3] 535 5.7.8 Authentication credentials invalid [3]

  6. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient.

  7. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The request has been rejected because it was anonymous. [17] 436 Bad Identity-Info The request has an Identity-Info header, and the URI scheme in that header cannot be dereferenced. [14]: p11 437 Unsupported Certificate The server was unable to validate a certificate for the domain that signed the request. [14]: p11 438 Invalid Identity Header

  8. Why can't I send mail to AOL Mail users? - AOL Help

    help.aol.com/articles/aol-mail-addresses-are-not...

    If you're repeatedly getting delivery failure errors when sending messages to AOL Mail customers, it is most likely due to spam blocking on AOL's servers. While you may be following at the rules for sending mail, it's likely the address you're sending mail from is hosted on a server our system had identified as "abusive".

  9. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

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