E-mail addresses with unusual formats (e-mail addresses that do not comply with RFC) cannot be used for credit card payments.
If you have entered an RFC-compliant e-mail address but still receive an error message prompting you to change your e-mail address when registering, selecting, or paying with a credit card, please contact us using the contact form and include the e-mail address causing the error.
■ What is RFC?
RFC is an international set of rules for the Internet.
Using unusual e-mail address formats that do not comply with RFC is usually not recommended, as they may cause problems when sending and receiving e-mails or registering on websites.
■ Examples of e-mail addresses that do not comply with RFC
・E-mail addresses with a period (.) immediately before the @ symbol or at the beginning of the address.
Example:
.pixiv@example.com
pixiv.@example.com
・Consecutive periods (.)
Example:
pixiv..@example.com
pixiv..pixiv@example.com