I don't think it blocks PMs, but if you're getting unwarranted PMs, ask the person to desist from sending you PMs, and if they continue to pepper your inbox, feel free to forward the relevant correspondence through to staff for review.
What is the final conviction that comes when radical attention is razor-edge sharp? That the object of the mind is mind-made (manomaya). (Ven. Ñāṇananda)
Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'. (Snp 3.6)