About joining

Q
Are there any email addresses that cannot be used for registration?
A
The following types of email addresses cannot be used as a general rule, as they do not comply with the global Internet communication standard RFC (Request for Comments).

<Non-RFC compliant email address>
1. If symbols other than "-", "_", ".", "+", "?", and "/" are included
2. When two or more consecutive symbols are used
3. When symbols are used at the beginning and end (immediately before @)
4. If the part before the @ is 64 characters or more
5. If the entire email address is longer than 256 characters

If you are using an email address that contains the relevant string, please register again using a different email address.

In addition, you cannot register email addresses from [AOL], [tac-net.ne.jp], or [i-younet.ne.jp] due to the special environment.

If you do not have an email address, please obtain a free email address such as Gmail or Yahoo!

Other questions regarding "About membership"

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