2.2.3.1.7 Disposition Notification Recipients

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To set the value of the PidTagReadReceiptRequested property ([MS-OXOMSG] section 2.2.1.29) and the values of the properties in the PidTagReadReceipt property group (section 2.6.1), clients MUST set the Disposition-Notification-To header value, as specified in [RFC3798].

MIME readers set the value of the PidTagReadReceiptRequested property to "TRUE" if the MIME header contains the Disposition-Notification-To header. If the MIME header does not contain the Disposition-Notification-To header, the value of the PidTagReadReceiptRequested property is not set.

MIME readers map the value of the PidTagReadReceipt property group from the value of the Disposition-Notification-To header, if the field exists.

When processing a TNEF message, MIME readers SHOULD use a Disposition-Notification-To header value specified in MIME format in preference to the PidTagReadReceiptRequested property and PidTagReadReceipt property group values of the attMsgProps attribute, as specified in [MS-OXTNEF] section 2.1.3.3.21, specified in a TNEF message (except for messages attached to a TNEF message, where the MIME counterpart is not available).