This is the Symantec Mail Security program at host sms1.krus.gov.pl. I'm sorry to have to inform you that your message could not be 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 Symantec Mail Security program <zpieczenia.wloclawek@krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User unknown. (in reply to RCPT TO command) <zpoczta.zetokat.com.plbefbef@krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User unknown. (in reply to RCPT TO command) <zqfyfbgudbsjqcwhylc@krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User unknown. (in reply to RCPT TO command) <ztyn@krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User unknown. (in reply to RCPT TO command) <zych@krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User unknown. (in reply to RCPT TO command)