public @interface Email

Requires the component value to be a syntactically valid e-mail address. The processor emits RegexConstraint.validEmail(message) into the Validator returned by Binding#getValidator().

@Bind(name="emailField") @Required @Email
private String email;

Stacks well with @Required – the standard email regex accepts the empty string as “not yet an address,” so combine with @Required when the field is mandatory.