Check if you have added your Hostify system email in to your property profile as Authorized senders -> click here to learn more.
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To send messages to the guests from Expedia, the guest email address needs to be included in the reservation details. You can ask your Expedia account manager to activate this option for your channel management connection.
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The Hostify software allows you to send out emails to the guests and receive the replies from the guests in the Hostify software.