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  2. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure. If the message keeps getting bounced back, make sure the account is closed or hasn't been moved.

  3. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  4. 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".

  5. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.

  6. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    The server is refusing to service the request because the Request-URI is longer than the server is willing to interpret. [1]: §21.4.12 415 Unsupported Media Type Request body in a format not supported. [1]: §21.4.13 416 Unsupported URI Scheme Request-URI is unknown to the server. [1]: §21.4.14 417 Unknown Resource-Priority

  7. List of SMTP server return codes - Wikipedia

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

    4.XXX.XXX Persistent Transient Failure: Message as sent is valid, but persistence of some temporary conditions has caused abandonment or delay. 5.XXX.XXX Permanent Failure: Not likely to be resolved by resending the message in current form. In general the class identifier MUST match the first digit of the Basic Status Code to which it applies. [1]

  8. Bounce message - Wikipedia

    en.wikipedia.org/wiki/Bounce_message

    A bounce message or just "bounce" is an automated message from an email system, informing the sender of a previous message that the message has not been delivered (or some other delivery problem occurred). The original message is said to have "bounced".

  9. Intercept message - Wikipedia

    en.wikipedia.org/wiki/Intercept_message

    An intercept message is a telephone recording informing the caller that the call cannot be completed, for any of a number of reasons ranging from local congestion, to disconnection of the destination phone, number dial errors or network trouble along the route.