こんにちは。送信はできるのですが、受信ができません。
メールを送ると
詳細ヘッダー
This is the mail system at host mgw2.zenno.net.

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 mail system
といったメッセージが送られてきます。
どうすれば良いのでしょうか？

返信する