code: def validate_email(value: str) -> Tuple[str, str]:
      
      if email_validator is None:
          raise ImportError('email-validator is not installed, run `pip install pydantic[email]`')
  
      m = PRETTY_REGEX.fullmatch(value)
      name: Optional[str] = None
      if m:
          name, value = m.groups()
  
      email = value.strip()
  
      try:
          email_validator.validate_email(email, check_deliverability=False)
      except email_validator.EmailNotValidError as e:
          raise errors.EmailError() from e
  
      return name or email[: email.index('@')], email.lower()
docs: Brutally simple email address validation. Note unlike most email address validation
      * raw ip address (literal) domain parts are not allowed.
      * "John Doe <local_part@domain.com>" style "pretty" email addresses are processed
      * the local part check is extremely basic. This raises the possibility of unicode spoofing, but no better
          solution is really possible.
      * spaces are striped from the beginning and end of addresses but no error is raised
  
      See RFC 5322 but treat it with suspicion, there seems to exist no universally acknowledged test for a valid email!