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  2. Fix problems sending AOL Mail

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

    If your contacts are getting emails you didn't send, your sent folder is full of messages you didn't send, or you're missing folders, it could be a sign that your account has been compromised or hacked. If you notice these signs, you may also end up having problems with sending or composing mail.

  3. Fix problems reading or receiving AOL Mail

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

    If possible, ask the sender to resend the message to see if you can get the message a second time. Check for emails in your Spam folder. If you find emails in your Spam folder that don't belong there, you'll need to mark the messages as "not spam." 1. Sign in to AOL Mail. 2. Click the Spam folder. 3. Select the message that isn't spam. 4.

  4. Greylisting (email) - Wikipedia

    en.wikipedia.org/wiki/Greylisting_(email)

    When a mail server is greylisted, the duration of time between the initial delay and the retransmission is variable; the greylisting server has no control or visibility of the delay. [4] SMTP says the retry interval should be at least 30 minutes, while the give-up time needs to be at least 4–5 days; [ 1 ] but actual values vary widely between ...

  5. List of SMTP server return codes - Wikipedia

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

    X.1.XXX Addressing Status; X.2.XXX Mailbox Status; X.3.XXX Mail System Status; X.4.XXX Network and Routing Status; X.5.XXX Mail Delivery Protocol Status; X.6.XXX Message Content or Media Status; X.7.XXX Security or Policy Status; The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248.

  6. Use full headers to find delivery delays or a forged email's ...

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

    Delivery records in the full headers show when each computer received the message. The first delivery is at the bottom; the newest at the top. If you find a large time gap between delivery records, that shows which computer delayed before sending it to the next computer. 1. View the full header as described above. 2.

  7. Anti-spam techniques - Wikipedia

    en.wikipedia.org/wiki/Anti-spam_techniques

    Various anti-spam techniques are used to prevent email spam (unsolicited bulk email).. No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) as opposed to not rejecting all spam email (false negatives) – and the associated costs in time, effort, and cost of wrongfully obstructing good mail.

  8. 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".

  9. Return receipt - Wikipedia

    en.wikipedia.org/wiki/Return_receipt

    DSN is both a service that may optionally be provided by Message Transfer Agents (MTAs) using the Simple Mail Transfer Protocol (SMTP), or a message format used to return indications of message delivery to the sender of the message. Specifically, the DSN SMTP service is used to request indications of successful delivery or delivery failure (in ...