Internet Direct (Indy) Version 9.0.2 Beta
TIdMessage.ReplyTo
Identifies the delivery address for message replies.

property ReplyTo: TIdEmailAddressList;
Description
ReplyTo is a TIdEmailAddressItem property that specifies the email address where replies to this message should be delivered. ReplyTo is used when the delivery address is different that From. ReplyTo contains the value from the RFC message header 'Reply-To'.