How to auto get and merge "First & Last" name and add "@domain.com" and lowercase the all letters?

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2 Answers

Try

=LOWER(SUBSTITUTE(C2," ",""))&"@example.com"

If you want an arrayformula instead that you don't need to drag down:

=ARRAYFORMULA(IF(LEN(C2:C),LOWER(SUBSTITUTE(C2:C," ",""))&"@example.com",""))

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