troubleshooting Question

DNS, Reverse Lookup Zone file, please critique.

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mobotFlag for United States of America asked on
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We maintain the primary DNS server in house, AT&T maintains the secondary's.  We just switched to AT&T as our ISP providor this past Tuesday.  Since then reverese lookup has stopped working, and some sites are rejecting email from us.  Below is our reverse lookup file, this is on the primary, and it has a stanza in named.conf.  I've done all the easy things like incrementing the serial number, stopped and started named, etc.
Can someone tell me why this file would not work?  Do I have a typo or a syntax error?  Would you have a suggestion on changing something that would improve it?  It did work for several years with the ISP we just switched from.



$ORIGIN  0-255.39.104.192.in-addr.arpa.
@             IN SOA gatekeeper.mobot.org. postmaster.mobot.org. (

                  4365        ;Serial
                  900                 ;Refresh
                  300                 ;Retry
                  604800           ;expire
                  3600 )       ;Minimum
; Name Servers
;
             IN NS gatekeeper.mobot.org.
             IN NS cmtu.mt.ns.els-gms.att.net.
             IN NS dmtu.mt.ns.els-gms.att.net.

;
; Addresses that point to Canonical name
;
;
14             IN PTR mbgmail01.mobot.org.
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