Here's a snippet of db.50.34.208
$TTL 86400
@ SOA ns1.cydian.com. domain-admin.cydian.com. ( 0406091449 3600 1800 604800 86400 )
@ NS ns1.cydian.com.
@ NS ns2.cydian.com.
...
241 PTR mail.dcstransusa.com.
The problem here may be that your zone file is for 50.34.208.in-addr.arpa, but Sprint isn't allocating that whole Class C range to you. Or could it be that the zone is just "50.34.208" rather than "50.34.208.in-addr.arpa"? http://www.dnsstuff.com/tools/lookup.ch?domain=50.34.208.in-addr.arpa&type=SOA&server=ns1.cydian.com shows that your DNS server doesn't know that it has a SOA record for 50.34.208.in-addr.arpa, so I'm guessing that the zone needs to be renamed to include the "in-addr.arpa".
-Scott
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