Maybe they're mad that it was their word to begin with

From Dictionary.com:
Oddly enough, the word `emailed' is actually listed in the OED;
it means "embossed (with a raised pattern) or perh. arranged in a
net or open work". A use from 1480 is given. The word is probably
derived from French `e'maille'' (enameled) and related to Old French
`emmailleu"re' (network). A French correspondent tells us that in
modern French, `email' is a hard enamel obtained by heating special
paints in a furnace; an `emailleur' (no final e) is a craftsman who
makes email (he generally paints some objects (like, say, jewelry)
and cooks them in a furnace).
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Matt