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  2. Bounce Address Tag Validation - Wikipedia

    en.wikipedia.org/wiki/Bounce_Address_Tag_Validation

    Any e-mail that is returned as a bounce without a valid signature can then be rejected. E-mail that is being bounced back should have an empty (null) return address so that bounces are never created for a bounce and therefore preventing messages from bouncing back and forth forever.

  3. Bounce message - Wikipedia

    en.wikipedia.org/wiki/Bounce_message

    When sending an e-mail, the service from which the e-mail is sent may be unable to reach the destination address. In such case, the sender would receive a bounce message from their own mail server. Common causes for mail servers being unable to reach a destination: Unable to resolve the destination address. For example, if the domain name does ...

  4. Bounce address - Wikipedia

    en.wikipedia.org/wiki/Bounce_address

    A bounce address is an email address to which bounce messages are delivered. There are many variants of the name, none of them used universally, including return path, reverse path, envelope from, envelope sender, MAIL FROM, 5321-FROM, return address, From_, Errors-to, etc. It is not uncommon for a single document to use several of these names.

  5. 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.

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

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

    To restore your ability to email AOL members, ask the administrator of your email domain to submit a request to the AOL Postmaster support team. The process to review these requests can take anywhere from a few hours to a few weeks to complete.

  7. 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:

  8. Emails in AOL Mail cannot be unsent

    help.aol.com/articles/recall-or-unsend-an-email...

    The ability to recall or unsend an email is not available in AOL Mail, because we provide a web-based service which sends messages instantly and once you send an email message, it's gone from your email server and out of our control. If you're unsure about sending an email, save the message to think things over, then send it later.

  9. Sender Rewriting Scheme - Wikipedia

    en.wikipedia.org/wiki/Sender_Rewriting_Scheme

    Instead, SRS aims at re-mailing a possible bounce back to Alice, so that forged bounces can become an alluring technique for injecting spam apparently originating from the rewriting sender. The local part , in this case alice , is moved because it may contain equal signs (=), so putting it at an extremity of the rewritten local part makes the ...