A unified communication application can allow a user to communicate with contacts across multiple electronic communication services. When the user desires to send a message, the communication application can identify a set of candidate account addresses associated with several electronic communication services in response to receiving a partial identifier of an intended recipient. The communication application can present a list including the set of candidate account addresses to the user. In response to receiving a user selection of one of the candidate account addresses, the communication application can determine a sender account from which to send the message.