Gmail lets you add "." in arbitrary places, but not to append additional text. For example: foobar@ foo.bar@ f.o.o.b.a.r@ are all valid and normalize the case

Gmail lets you add "." in arbitrary places, but not to append additional text. For example: foobar@ foo.bar@ f.o.o.b.a.r@ are all valid and normalize the case without the periods.