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  2. List of SMTP server return codes - Wikipedia

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

    554 Transaction has failed (Or, in the case of a connection-opening response, "No SMTP service here") 554 5.3.4 Message too big for system [ 4 ] 556 Domain does not accept mail [ 5 ]

  3. 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.

  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. Fix problems sending AOL Mail

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

    If you're having problems sending mail, there are a few troubleshooting steps you can take to fix the problem. Restart your computer:. If you haven't shut down your computer in a while, we recommend that you begin troubleshooting by restarting your computer.

  6. Postmaster (computing) - Wikipedia

    en.wikipedia.org/wiki/Postmaster_(computing)

    Any system that includes an SMTP server supporting mail relaying or delivery MUST support the reserved mailbox "postmaster" as a case-insensitive local name. This postmaster address is not strictly necessary if the server always returns 554 on connection opening (as described in section 3.1). [1]

  7. 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".

  8. AOL Mail for Verizon Customers - AOL Help

    help.aol.com/products/aol-mail-verizon

    Learn about why you might have received a delivery failure notice, and how to determine what's inside the message. AOL Mail for Verizon Customers · Apr 30, 2024 Create and manage 3rd-party app passwords

  9. 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.