• What is the X-MS-TNEF-Correlator header?

    It's value is a message id. Normally it is equal to the Message-ID: header but on some cases it has a different one. Why is this?

    any help would be greatly appreciated thanks.
    Friday, April 24, 2009 7:58 AM


All replies


    drop the scroll bar to the bottom of the page. That's what you want.

    • Proposed as answer by Johnny Will Monday, April 27, 2009 10:21 AM
    • Marked as answer by Elvis Wei Thursday, April 30, 2009 7:58 AM
    Monday, April 27, 2009 10:21 AM
  • This doesn't help and shouldn't have been marked as the answer because Experts Exchange doesn't show the answer unless one pays them for their service.

    Quoting this page:

    "Pronounced tee-neff, and short for Transport Neutral Encapsulation Format, a proprietary format used by the Microsoft Exchange and Outlook e-mail clients when sending messages formatted as Rich Text Format (RTF). When Microsoft Exchange thinks that it is sending a message to another Microsoft e-mail client, it extracts all the formatting information and encodes it in a special TNEF block. It then sends the message in two parts - the text message with the formatting removed and the formatting instructions in the TNEF block. On the receiving side, a Microsoft e-mail client processes the TNEF block and re-formats the message.

    Unfortunately, most non-Microsoft e-mail clients cannot decipher TNEF blocks. Consequently, when you receive a TNEF-encoded message with a non-Microsoft e-mail client, the TNEF part appears as a long sequence of hexadecimal digits, either in the message itself or as an attached file (usually named WINMAIL.DAT). These WINMAIL.DAT files serve no useful purpose so you can delete them."
    Wednesday, February 10, 2016 4:55 PM