Gmail addresses can be represented using dots in between any letter.

For example, janedoe@gmail.com can be written as:

j.anedoe@gmail.com

j.a.nedoe@gmail.com

j.a.n.edoe@gmail.com

j.a.n.e.doe@gmail.com

j.a.n.e.d.oe@gmail.com

j.a.n.e.d.o.e@gmail.com.