I think you may need to update the PTR record on your SOA for that zone - as that is what they are complaining about? When you do, increment the SOA serial number by 1 so it propagates to the ROOT servers in 24 hours - usually a lot less...
Honestly? Sites like JustSpam usually mean well - but - are typically run by a bunch of knuckleheads who can't spell "DNS" or "SOA"...
I presume you conducted a DIG on the primary zone, to know all is in order, right?
Anyway - let me know if I can assist, OK??
John
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