メールサーバで色々はまった. どっちかと言うとネームサーバの設定ミスが多かったが.
This is the Postfix program at host ********.**.**.jp. I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. For further assistance, please send mail to <postmaster> If you do so, please include this problem report. You can delete your own text from the attached returned message. The Postfix program <user@mail.new.***.domain.org>: host mail.new.***.domain.org[***.***.***.***] said: 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1) (in reply to RCPT TO command)