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<Examples of common Email addresses that cannot be registered>
◆There is a period "." Immediately before the at sign "@" or at the beginning of the Email address (example: .abcd. @ Amuse.co.jp)
◆A period "." Is continuous before sign "@" (example: ab..cd @ amuse.co.jp)
◆Contains characters other than half-width alphanumeric characters and some symbols ".! # $ % & ' * + - / =? ^ _ { { | } ~"
◆A domain that does not exist is specified after at sign "@".