Tropper doesn't know when to give up

Does anyone have sound advice concerning the appropriate response to the following threatening notice which I received today
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Mr. Eidensohn,

Your desultory attitude is unacceptable. So let me make it plain.Your postings about Rabbi Tropper are libelous and outrageous. I presume you are familiar with the common law doctrine of universal Internet jurisdiction which permits non-resident plaintiffs to sue non-resident defendants for publishing libelous materials accessible over the Internet. If not, I will gladly supply you withe the case law references.  I am advised you posted these defamatory materials about Rabbi Tropper at the behest of Guma Aguiar. You are familiar with Aguiar's widely published conflicts with Rabbi Tropper.  Unless you immediately take down all your posts about Rabbi Tropper, I will advise him to engage counsel inside and outside Israel to sue you; Be advised that, under the doctrine of comity, Israel will enforce foreign money judgments against you, especially judgments rendered by common law courts in Britain, Australia, Canada, the U.S., etc.  I won't wait until Sunday to give Rabbi Tropper that advice.Accordingly, let me know what you plan to do upon your receipt of this E-mail.

Samuel A. Abady, J.D.

Spokesman for Rabbi Leib Tropper