This is the Postfix program at host

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

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

The Postfix program

: host[] said: 554 Mail for rejected for policy reasons. (in reply to RCPT TO