Why do messages to and from some contacts are noted with '«««' and '»»»', while for some others '<<<' and '>>>' are used?
The style of those indicates the transport mechanism used. '<<<' and '>>>' are non-acknowledged messages through the server, '«<<' and '>>»' are acknowledged messages through the server, '«««' and '»»»' are acknowledged messages via a direct connection, and finally '»%»' and '«%«' acknowledged messages via an SSL-encrypted direct connection.

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