spam from Ukraine

Received: from HELLO (unknown [5.248.157.117])
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% Abuse contact for '5.248.128.0 - 5.248.255.255' is 'abuse@kyivstar.net'
inetnum:        5.248.128.0 - 5.248.255.255
netname:        KYIVSTAR-NET-16
descr:          Kyivstar GSM
descr:          Ukrainian mobile phone operator
country:        UA
admin-c:        KSUA-RIPE
tech-c:         KSUA-RIPE
status:         ASSIGNED PA
mnt-by:         KYIVSTAR-MNT
mnt-lower:      KYIVSTAR-MNT
mnt-routes:     KYIVSTAR-MNT
created:        2012-10-22T06:44:55Z
last-modified:  2012-10-22T06:44:55Z
source:         RIPE