Mail delivery error

Hi,

I have a problem, because I receive mail that my review request was not delivered. I have tried to send review request to different (working) e-mails and it has failed.

I recieved e-mail in return, please see bellow.

Can you give me any suggestion what could be wrong?

e-mail message:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:

…@…
host lucmx01.luc.fi [193.167.87.142]
SMTP error from remote mail server after RCPT TO:anneli.lauriala@ulapland.fi:
550-5.1.1 anneli.lauriala@ulapland.fi: Recipient address rejected:
User unknown in relay recipient table
550 5.1.1 For assistance, see www.luc.fi or contact +358404844333. Please provide the following information in your problem report:
Time: (May 15 14:41:24), Client: (91.185.211.194), Server:
(lucmx01.luc.fi).