What th'?: "This message may not have been sent by"

[Jonathan Lighter]

Every message I've received today, including from myself, bears this
warning.

Any idea why?  Gmail Help is no help. (My own messages were sent the usual
way rather than from any odd website.)

JL

--
"If the truth is half as bad as I think it is, you can't handle the truth."

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The American Dialect Society - http://www.americandialect.org