Turning off PMs.

[Myk Rian]

Is there a way to deny PMs from a single user, besides using ignore?

[Lee Schierer]

You can change your general setting to allow PM's only from your approved contacts and moderators.
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I don't know of any way to stop one particular member other than to report the offender to the moderators or Admin.

[Bruce Page]

If someone is sending you offensive messages report it as Lee suggests. Otherwise, check the box to the right and delete.