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2.1.3.2.28 ReplyBy Time

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To generate a Reply-By header, clients set the PidTagReplyTime property ([MS-OXOFLAG] section 2.2.3.1) to the date and time by which a reply is requested. Clients also MUST set the PidLidFlagRequest property ([MS-OXOFLAG] section 2.2.1.9), as specified in section 2.1.3.2.25, to any non-empty string value. If the PidLidFlagRequest property is not set, the Reply-By header will not be generated.

MIME writers SHOULD<57> copy the value of the PidTagReplyTime property to the Reply-By header.