Enhancing and personalizing an electronic message with related and relevant information based on context of the message and recipients of the message is provided. A mailbox delivery agent receives an electronic message addressed to a recipient, extracts context data from the electronic message, queries an information source for information related to the context data and relevant to the recipient user, receives a response including information related to the context data and relevant to the recipient user, and generates and appends one or more information elements representative of the information related to the context data and relevant to the recipient user to the electronic message.