You can also use `.`s arbitrarily, so your 'foo.bar@gmail.com` is 'really' (you might say) `foobar@gmail.com` but also equivalently `f.o.o.b.a.r@gmail.com` and whatever else.
Yes I believe so, which is the domain I used in examples and that the comment I replied to was about? While `+anything` is per RFC, it's not widely implemented either.