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You don't.
What VPN?

What are the chances that two newbies, joining within a day of each other have the same IP address?
Add in the Post of one was answered in under 3 minutes by the other.
Rub...

Guilty on all charges.

Acorn

Egg, sorry, I voided the other two links.

For the Blacklist Check Link you (FF) need: javascript: void (window.location.href = "https://mxtoolbox.com/SuperTool.aspx?action=blacklist: " +...

I am passing on a tool that non-Mods could play with.

Acorn

I use this now to check up on iffy Posters: 129565

I use JSON for a range of things - red search.
Others might prefer a CSV version - green search.

I did think of The Matrix (blue and red) but...