params:
  mail:
    validators:
      - Email#email
      - String#max_length:
          max: 100
  mail_array:
    array: 1
    validators:
      - Email#email
      - String#max_length:
          max: 100
  mail_array_required:
    array: 1
    validators:
      - Blank#not_blank
      - Email#email
      - String#max_length:
          max: 100