Pondus,

Apart from what essexboy gives as a valid malcode alert, there are the following issues to consider:

1 Mail server and 29 domains: http://www.reversemx.com/mxip/83.103.51.23/
the IP history of detection: https://www.virustotal.com/nl/ip-address/83.103.51.23/information/
and live malware on IP here: http://support.clean-mx.de/clean-mx/viruses?id=14619312

The following name servers know about domain names for which they are not authoritative.
They might support recursive queries (a security risk! this remark from me, polonus)

dns2.technorail dot com
dns.technorail dot com
dns4.arubadns dot cz
dns3.arubadns dot net according to: http://www.solvedns.com/mxcenter.it

polonus