answer: #Person2# gives #Person1# an incomplete email address, then #Person1# takes the mailing address for example, so #Person2# understands and offers the complete email address.
documents: #Person1#: What's your email address?
  #Person2#: It's bulldog 123.
  #Person1#: Bulldog 123. Are you sure that's all?
  #Person2#: Yes.
  #Person1#: No. That's incomplete.
  #Person2#: What do you mean?
  #Person1#: What's your mailing address?
  #Person2#: 456 Cherry Drive, Pasadena, CA 91170.
  #Person1#: That's correct.
  #Person2#: So what's the problem?
  #Person1#: Bulldog 123 is just the street. You have to give me the city, state, and ZIP code.
  #Person2#: Oh, I get it. My email address is bluedog123@yahoo. com.