US Patent 8433764 Identification of message recipients

In general, the subject matter described in this specification can be embodied in methods, systems, and program products for identifying a recipient for an electronic post. An electronic post that was authored by an authoring user is received. The post is detected to include text that partially, but not fully, identifies a target recipient for the post. The text that partially identifies the target recipient is determined to be associated with a valid first user account for a first domain or a valid second user account for a second domain. The first user account or the second user account is selected as a selected user account for the target recipient based on the determining. The electronic post is transmitted to a different remote computing device that is associated with the selected user account.