Just re-checked, and the Groups.io signature is nowhere to be found in messages I send by e-mail.  Some have my regular Gmail signature, others nothing but the text of the message I sent (formatted, of course).

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Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763 
The terrible state of public education has paid huge dividends in ignorance.  Huge.  We now have a country that can be told blatant lies — easily checkable, blatant lies — and I’m not talking about the covert workings of the CIA. When we have a terrorist attack, on September 11, 2001 with 19 men — 15 of them are Saudis — and five minutes later the whole country thinks they’re from Iraq — how can you have faith in the public? This is an easily checkable fact. The whole country is like the O.J. Simpson jurors.

      ~ Fran Lebowitz in Ruminator Magazine interview with Susannah McNeely (Aug/Sept 2005)