2.2.3.1.6 Reply Recipients

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To set the values of the PidTagReplyRecipientEntries property ([MS-OXOMSG] section 2.2.1.43) and the PidTagReplyRecipientNames property ([MS-OXOMSG] section 2.2.1.44), clients MUST set the Reply-To header value, as specified in [RFC2822].

Note that because the value of the Reply-to header is an address list and not a single address, the property mapping is not a recipient property group.

MIME readers set the values of the PidTagReplyRecipientEntries property and the PidTagReplyRecipientNames property by mapping addresses from the Reply-To header.

When processing a TNEF message, MIME readers SHOULD use a Reply-To header value specified in MIME format in preference to the PidTagReplyRecipientEntries property value and the PidTagReplyRecipientNames property 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 format counterpart is not available).