This is the Symantec Mail Security program at host sms1.krus.gov.pl.
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The Symantec Mail Security program
<zpieczenia.wloclawek(a)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(a)krus.gov.pl>: host
poczta.krus.gov.pl[10.0.206.10] said: 550 User unknown. (in reply to RCPT
TO command)
<zqfyfbgudbsjqcwhylc(a)krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said:
550 User unknown. (in reply to RCPT TO command)
<ztyn(a)krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User
unknown. (in reply to RCPT TO command)
<zych(a)krus.gov.pl>: host poczta.krus.gov.pl[10.0.206.10] said: 550 User
unknown. (in reply to RCPT TO command)