Some sites may not accept an email address that includes a subdomain (@subdomain.mozmail.com) and others have stopped accepting all addresses except those from Gmail, Hotmail, or Yahoo accounts.
有些网站可能不接受包含子域（如 @subdomain.mozmail.com）的邮箱地址，而有些网站已停止接受除 Gmail、Hotmail 和 Yahoo 外的所有电子邮件地址。