A telecommunications system includes a plurality of electronic messaging clients (122); at least one messaging server (104) having an e-mail presence activation module (114) adapted to receive an e-mail and determine therefrom whether a presence of a recipient is to be determined, and a presence module...http://www.google.de/patents/US7761516?utm_source=gb-gplus-sharePatent US7761516 - System and method for e-mail presence confirmation
