I've just finished a plugin to let you accept private messages from some users but not others *hallelujah*

If you have "Accept Private Messages" set to no in your profile then that takes precedence and users won't be able to send you any pms, but if you have it set to yes then you can enter a list of names in your profile and they will not be allowed to pm you.

I thought about allowing users to add a custom message that would be shown when someone in their blocked list tries to send them a pm but thought that could get ugly

There is a little bit of html to add into user_profile_basic.html - that is just the textarea for the username list, apart from that it installs itself and runs itself.

Have fun.

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