Hello,

I have a question maybe someone can help or comment.

How can one protect in the real world against faking the identity of presence 
subscriptions originating from foreign domains?

The scenario is:

Once us...@domaina accepts presence subscriptions from us...@domainb and his 
pre-rules is updated with this information, nobody stops somebody else to 
impersonate us...@domainb to send subscribe messages from any source and 
presenting the same From header.

How can the server that serves domainA check for the real identity of the 
foreign subscriber?

Can anyone comment what would be a good practical solution?

Regards,
Adrian


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