Although even if you rank up to the JNR member rank, there are still members you might not be able to message as their settings might only allow messages from a specific rank upward.
is there a feature like that? As far as I know, you can only enable not getting PMs from newbies.
No, there isn't; it's just newbies disabled by default. Thanks for calling back to my attention. The only members aside from newbies who can't send messages to a particular user are those who are blacklisted by the user itself from receiving messages from them.