>623,624
レスありがとうございます。
中の部分はこんな感じでした。
rcpthostsってのをちょっと調べた感じでは、受け取った側(この場合OCN)が
x-mail側へのリレーを禁止してるのかなぁと思ったんです。


This is the Postfix program at host m-cb212p.ocn.ne.jp.

I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.

For further assistance, please contact <[email protected]>

If you do so, please include this problem report. You can
delete your own text from the message returned below.

--------------------------------------------------------

<[email protected]>: host c.mx.x-mail.jp[202.221.139.53] said: 553 sorry, that
domain isn't in my list of allowed rcpthosts (#5.7.1)