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doctorbillFlag for United Kingdom of Great Britain and Northern Ireland

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spam and rDNS

Can someone please help me resolve the following issue:

I am getting the following spam block message from my sbs server 2003 when I send an email to an address using a particular ISP:

Wed 2012-12-26 11:56:10: <-- 550 5.7.1 Mail from 83.104.135.228 blocked using Trend Micro RBL+. Please see http://www.mail-abuse.com/cgi-bin/lookup?ip_address=83.104.135.228

Their response to get over this is as follows:

Add the rDNS of this IP to clearly indicate static.
ex: mail.mail-abuse.com (O)
99-47-70-150.dynamic-IP.mail-abuse.com (X)

They suggest that I need to specify in my DNS settings that I have a static IP address and to use the script above
I have no idea what to do to get this resolved
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Response to Answer 1:
A ping to 83.104.135.228 gives the following in a command prompt:

Pinging ptravel-adsl.demon.co.uk [83.104.135.228] with 32 bytes of data:

Reply from 83.104.135.228: bytes=32 time=24ms TTL=62
Reply from 83.104.135.228: bytes=32 time=4ms TTL=62
Reply from 83.104.135.228: bytes=32 time=4ms TTL=62
Reply from 83.104.135.228: bytes=32 time=4ms TTL=62

Ping statistics for 83.104.135.228:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 4ms, Maximum = 24ms, Average = 9ms

Response to Answer 2:
Domain name is perfectdemon.dnsalias.net (83.104.135.228) - this is pointing to me sbs server

Can I not set up rDNS on my own sbs server ?
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My ISP is Demon (Thus) - they supply us with our adsl line and static IP address
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