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  2. Return receipt - Wikipedia

    en.wikipedia.org/wiki/Return_receipt

    A non-standard but widely used way to request return receipts is with the "Return-Receipt-To:" (RRT) field in the e-mail header, with the email return address specified. The first time a user opens an email message containing this field in the header, the client will typically prompt the user whether to send a return receipt.

  3. List of HTTP header fields - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_header_fields

    The length of the request body in octets (8-bit bytes). Content-Length: 348: Permanent RFC 9110: Content-MD5: A Base64-encoded binary MD5 sum of the content of the request body. Content-MD5: Q2hlY2sgSW50ZWdyaXR5IQ== Obsolete [15] RFC 1544, 1864, 4021: Content-Type: The Media type of the body of the request (used with POST and PUT requests).

  4. Email tracking - Wikipedia

    en.wikipedia.org/wiki/Email_tracking

    Some email applications, such as Microsoft Office Outlook and Mozilla Thunderbird, employ a read-receipt tracking mechanism.The sender selects the receipt request option prior to sending the message, and then upon sending, each recipient has the option of notifying the sender that the message was received or read by the recipient.

  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. The Real Reason Costco Checks Your Receipt When You're ... - AOL

    www.aol.com/real-reason-costco-checks-receipt...

    Here are the biggest reasons Costco checks receipts at the door, including ones that'll leave you grateful for the inconvenience (hear us out). Related: Costco's Delicious New Holiday Cake Has ...

  7. XMLHttpRequest - Wikipedia

    en.wikipedia.org/wiki/XMLHttpRequest

    For an asynchronous request, set a listener that will be notified when the request's state changes: request . onreadystatechange = listener ; Initiate the request by calling the "send" method:

  8. 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.

  9. Find missing emails in AOL Mail

    help.aol.com/articles/find-missing-emails-in-aol...

    Deleting email from the Trash removes it from your account. Apps that use POP. Desktop apps, like Outlook, Thunderbird, and Mac Mail, can access AOL Mail using POP. Copies of your email download to the app, so actions in the app won't affect your account. One POP setting, however, will delete email from your account when it's downloaded.