metadata:
  version: "1.0.0"
  last_updated: "2026-02-01"
  source_urls: []

category: formats
subcategory: email
tier: T2

bugs_caught:
  - "Email validation too strict"
  - "Email validation too lenient"
  - "RFC compliance issues"

values:
  # Valid but often rejected
  plus_addressing:
    value: "user+tag@example.com"
    valid: true
    bugs_caught:
      - "Plus addressing rejected"
      - "Gmail style tagging"
    safe_for_automation: true

  subdomain:
    value: "user@mail.example.com"
    valid: true
    bugs_caught:
      - "Subdomain handling"
    safe_for_automation: true

  numeric_domain:
    value: "user@123.45.67.89"
    valid: true
    bugs_caught:
      - "IP address domain"
    safe_for_automation: true

  quoted_local:
    value: "\"user name\"@example.com"
    valid: true
    bugs_caught:
      - "Quoted local part"
      - "Space in email"
    safe_for_automation: true

  dotted_local:
    value: "user.name.here@example.com"
    valid: true
    bugs_caught:
      - "Multiple dots handling"
    safe_for_automation: true

  single_char_local:
    value: "a@example.com"
    valid: true
    bugs_caught:
      - "Single character local"
    safe_for_automation: true

  long_local:
    value: "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa@example.com"
    valid: true
    bugs_caught:
      - "64-char local part limit"
    safe_for_automation: true
    note: "Max 64 chars in local part"

  new_tld:
    value: "user@example.technology"
    valid: true
    bugs_caught:
      - "New TLD rejection"
      - "TLD length assumptions"
    safe_for_automation: true

  idn_domain:
    value: "user@münchen.de"
    valid: true
    bugs_caught:
      - "International domain name"
      - "Punycode handling"
    safe_for_automation: true

  # Invalid but often accepted
  double_dot:
    value: "user..name@example.com"
    valid: false
    bugs_caught:
      - "Consecutive dots invalid"
    safe_for_automation: true

  leading_dot:
    value: ".user@example.com"
    valid: false
    bugs_caught:
      - "Leading dot invalid"
    safe_for_automation: true

  trailing_dot_local:
    value: "user.@example.com"
    valid: false
    bugs_caught:
      - "Trailing dot in local"
    safe_for_automation: true

  no_at:
    value: "userexample.com"
    valid: false
    bugs_caught:
      - "Missing @ sign"
    safe_for_automation: true

  double_at:
    value: "user@@example.com"
    valid: false
    bugs_caught:
      - "Double @ sign"
    safe_for_automation: true

  no_domain:
    value: "user@"
    valid: false
    bugs_caught:
      - "Missing domain"
    safe_for_automation: true

  no_local:
    value: "@example.com"
    valid: false
    bugs_caught:
      - "Missing local part"
    safe_for_automation: true

  space_unquoted:
    value: "user name@example.com"
    valid: false
    bugs_caught:
      - "Unquoted space"
    safe_for_automation: true

  special_unquoted:
    value: "user<>@example.com"
    valid: false
    bugs_caught:
      - "Special chars unquoted"
    safe_for_automation: true

  empty:
    value: ""
    valid: false
    bugs_caught:
      - "Empty email"
    safe_for_automation: true