# CF401

Source: https://xmlvalid.com/rules/CF401

> Enter valid e-mail address - ….

- Level: error
- Rule sets: MyInvois validations of LHDN (Malaysia) MyInvois SDK of 25 September 2026
- Context: `/*/cac:AccountingSupplierParty/cac:Party | /*/cac:AccountingCustomerParty/cac:Party`
- Test: `$email = ('', 'NA') or matches($email, '^[^@\s]+@[^@\s]+\.[^@\s]+$')`

Validate a document against these rules: https://xmlvalid.com/validate