Introduce a usermode +R (block unauthed user messages) #33
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If a client sets mode +R, unauthenticated clients will receive an error when trying to privmsg, cprivmsg, notice, cnotice, or invite them. The message will be something like:
:London.UK.Eu.UnderNet.org 477 charlie alice :You need to be identified to a
registered account to contact this user -- you can obtain an account from
http://cservice.undernet.org/live/
This is the same numeric used when unauthed users try to join a +r channel, matching InspIRCd.