Gmail has the `+` trick and ignores any `.`s in the name area. E.g. `foo@gmail.com`, `foo+bar@gmail.com` and `f.o.o@gmail.com` will all deliver to the same gmail inbox.

It's not nothing (I tend to use it to track how my email address is being sold), but not a real level of masking, since anyone in the know could regenerate the "standard" address easily.