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Bohmian.org - Discussion - GoogleTalk
 
m 
 posted December 24, 2008
GoogleTalk is a very odd hybrid system, which outwardly exposes an 
XMPP interface to clients as well as other servers.   However, it does odd and possibly dangerous things, such as respond to 
Jabber messages via 
SMTP assuming that the 
JID is also a valid 
RFC 822 e-mail address.
In some systems, different users could own a Jabber account and an e-mail address which are identical except for the schema.