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  2. List of SMTP server return codes - Wikipedia

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

    This is a list of Simple Mail Transfer Protocol (SMTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. Unless otherwise stated, all status codes described here is part of the current SMTP standard, RFC 5321. The message phrases shown are typical, but any human-readable alternative ...

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

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

    1. Sign into AOL Mail on a web browser. 2. Compose an email and add your own email address in the "To" field. 3. Send the email and check if it arrives.

  4. 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.

  5. Simple Mail Transfer Protocol - Wikipedia

    en.wikipedia.org/wiki/Simple_Mail_Transfer_Protocol

    The initiating host, the SMTP client, can be either an end-user's email client, functionally identified as a mail user agent (MUA), or a relay server's mail transfer agent (MTA), that is an SMTP server acting as an SMTP client, in the relevant session, in order to relay mail. Fully capable SMTP servers maintain queues of messages for retrying ...

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

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

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.

  7. 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.

  8. Callback verification - Wikipedia

    en.wikipedia.org/wiki/Callback_verification

    Callback verification, also known as callout verification or Sender Address Verification, is a technique used by SMTP software in order to validate e-mail addresses.The most common target of verification is the sender address from the message envelope (the address specified during the SMTP dialogue as "MAIL FROM").

  9. List of mail server software - Wikipedia

    en.wikipedia.org/wiki/List_of_mail_server_software

    This is a list of mail server software: mail transfer agents, mail delivery agents, and other computer software which provide e-mail. Product statistics [ edit ]