In general, email addresses that violate the Request for Comments (RFC), an international standard, cannot be registered.
Some services may allow the use of email addresses that violate RFC standards; we do not recommend using such addresses, as it may result in you not receiving emails from HH Cross and other services.
If you have already registered the email address that violate RFC, please click < click here > and change your email address from My Page.
Examples of RFC violations:
■Case 1
A period (.) immediately before an @ sign or at the beginning of an e-mail address.
abcd.@example.co.jp
.abcd@example.co.jp
■Case 2
A period (.) that continuous before an @ sign.
abcd.. @example.co.jp
ab..cd@example.co.jp
■Case 3
Email addresses that contain characters other than single-byte alphanumeric characters and some symbols ( . ! # $ % & ' * + ? / = ? ^ _ { | } ~ ).
ab[cd@example.co.jp
ab@cd@example.co.jp