1. A method comprising: maintaining information characterizing one or more of an appearance, a voice, or a behavior of a person; receiving information indicative of (a) content that is to be part of a message to be delivered to a recipient on behalf of the person, (b) a relationship between the person and the recipient, and (c) a delivery time for delivery of the message, in which the content, the delivery time, or both are not present in the received information; inferring one or more of (i) the content based on the received information indicative of the content, including inferring at least some of the content at the delivery time, (ii) an identity of the recipient based on the received information indicative of the relationship between the person and the recipient, or (iii) the delivery time based on the received information indicative of the delivery time; and delivering the message to the recipient at the delivery time on behalf of the person, the message including the content, the delivering including providing a customized natural language response to an input received from the recipient, the providing of the response comprising using a digital representation of the person generated based on one or more of the appearance, the voice, or the behavior of the person.
1. A method comprising: maintaining information characterizing one or more of an appearance, a voice, or a behavior of a person; receiving information indicative of (a) content that is to be part of a message to be delivered to a recipient on behalf of the person, (b) a relationship between the person and the recipient, and (c) a delivery time for delivery of the message, in which the content, the delivery time, or both are not present in the received information; inferring one or more of (i) the content based on the received information indicative of the content, including inferring at least some of the content at the delivery time, (ii) an identity of the recipient based on the received information indicative of the relationship between the person and the recipient, or (iii) the delivery time based on the received information indicative of the delivery time; and delivering the message to the recipient at the delivery time on behalf of the person, the message including the content, the delivering including providing a customized natural language response to an input received from the recipient, the providing of the response comprising using a digital representation of the person generated based on one or more of the appearance, the voice, or the behavior of the person. 2. The method of claim 1 , in which delivering the message includes delivering a multimedia message.