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  2. List of SMTP server return codes - Wikipedia

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

    A "Basic Status Code" SMTP reply consists of a three digit number (transmitted as three numeric characters) followed by some text. The number is for use by automata (e.g., email clients) to determine what state to enter next; the text ("Text Part") is for the human user. The first digit denotes whether the response is good, bad, or incomplete:

  3. 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. These messages are sent automatically and often include the reason for the delivery failure.

  4. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    The problem could be caused by server delays due to a lot of people accessing their email at once. Usually this is resolved in just a few minutes. Be aware, if the picture was sent in an unsupported file format, such as TIFF, you may not be able to view it. Ask the sender to resend the picture using JPG or GIF file format. Check the attachments

  5. Bounce address - Wikipedia

    en.wikipedia.org/wiki/Bounce_address

    bounce address - When an email can not be delivered, the MTA will create a bounce message and send it to the address given by the MAIL FROM command. Used in RFC 4406. return path - When the email is put in the recipient's email box, a new mail header is created with the name "Return-Path:" containing the address on the MAIL FROM command.

  6. Email incorrectly delivered to the Trash folder - AOL Help

    help.aol.com/articles/email-incorrectly...

    Are important emails not showing up in your Inbox? Emails from specific senders may be set up to go to the trash or other folders. Check your settings to view or change where they're going. • If you've set up filters, the settings may be routing some emails to the trash.

  7. Message transfer agent - Wikipedia

    en.wikipedia.org/wiki/Message_transfer_agent

    When a recipient mailbox of a message is not hosted locally, the message is relayed, that is, forwarded to another MTA. Every time an MTA receives an email message, it adds a Received trace header field to the top of the header of the message, [4] thereby building a sequential record of MTAs handling the message. The process of choosing a ...

  8. Find delivery delays or identify the sender in AOL Mail

    help.aol.com/articles/use-full-headers-to-find...

    View the full headers to find out where an email was delayed or if the real sender disguised their email address. View the full header of an email. 1. Click an email to open it. 2. Click the More drop-down in the top menu. 3. Select View Message Source. Use header info to investigate problems. See where an email was delayed

  9. Sender Policy Framework - Wikipedia

    en.wikipedia.org/wiki/Sender_Policy_Framework

    Sender Policy Framework (SPF) is an email authentication method which ensures the sending mail server is authorized to originate mail from the email sender's domain. [ 1 ] [ 2 ] This authentication only applies to the email sender listed in the "envelope from" field during the initial SMTP connection.