Subject: Mail delivery failed: returning message to sender

From: Mail Delivery System <[email-masked]>
Date: Wed, 24 Sep 2008 09:20:00 +0300

This is the Postfix program at host wall.deac.lv.

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:

  [email-masked]
    SMTP error from remote mailer after RCPT TO:<[email-masked]>:
    host mxgt.deac.lv [89.111.5.22]: 550-Callout verification failed:
    550 550 5.1.1 <[email-masked]>... User unknown

------ This is a copy of the message's headers. ------

From: =?koi8-r?B?8sHa18nUycU=?= <[email-masked]>
To: <[email-masked]>
Subject: =?koi8-r?B?9d7Fws7ZyiDL1dLTOvLB2tLBws/Uy8EgwsnazsXTINDMwc7BIM7BIA==?=
	=?koi8-r?B?0NLFxNDSydHUyckuIA==?=
Date: Tue, 23 Sep 2008 17:44:29 +0100