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Re:Egypt has blocked encrypted messaging app Signal by cesarb on Tuesday December 20, 2016 @08:27PM (#13226046)
Thanks for the links. It seems my knowledge was outdated.

Do you have any links for the "solutions for the abuse problem" part? They should make for interesting reading.

Re:Egypt has blocked encrypted messaging app Signal by apichat on Tuesday December 20, 2016 @08:40PM (#13226130)
> solutions for the abuse problem

A solution is using address like greeting@name (meaning localpart@dnspart) https://linuxfr.org/users/apichat/journaux/salut-toto-saluta...

An other solution is the design of XMPP : you can control who can speak with you (the contact list).