-----Original Message-----
From: Mail Delivery System [mailto:MAILER-DAEMON@mail-proxyout-10.websupport.sk]
Sent: Tuesday, December 12, 2017 7:27 AM
To: hoffreiterova@mlconsortio.sk
Subject: Undelivered Mail Returned to Sender

This is the mail system at host mail-proxyout-10.websupport.sk.

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 postmaster.

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

                   The mail system

<m.zapletalova@saker.cz>: host mail1.viamedia.cz[79.170.251.35] said: 550 5.7.0
    Your server IP address is in the SORBS DNSBL database, bye (in reply to
    RCPT TO command)

Final-Recipient: rfc822; m.zapletalova@saker.cz
Original-Recipient: rfc822;m.zapletalova@saker.cz
Action: failed
Status: 5.7.0
Remote-MTA: dns; mail1.viamedia.cz
Diagnostic-Code: smtp; 550 5.7.0 Your server IP address is in the SORBS DNSBL
    database, bye