The following criteria must be met for an email address to be registered:
- Only ASCII letters and numbers and the symbols ""."", ""+"", ""-"", ""/"", ""?"", and ""_"" are allowed.
- A dot (""."") cannot be used two or more times consecutively.
- A dot (""."") cannot appear as the first or last character immediately before the ""@"" symbol.
-Only lowercase letters are allowed. If you enter uppercase letters, the system will convert them to lowercase.