[exim] No reverse DNS: Sender verify failed

I have one client who is unable to send through an exim server.

exim/reject.log:2013-08-14 20:50:09 H=(mail.paradisefound.com<http://mail.paradisefound.com>) [24.214.233.54] F=<jason.branks@???<mailto:jason.branks@paradisefound.com>> rejected RCPT <kstewart@???<mailto:kstewart@sssjb.com>>: No reverse DNS: Sender verify failed

The RDNS matches both reverse and forward. Can anyone shine some light on this as to why it would be blocked ?

drop    message       = REJECTED - We do not accept messages from hosts without reverse DNS
          log_message   = No reverse DNS
          !verify       = reverse_host_lookup
          !verify       = sender/no_details/callout=2m,defer_ok
          !condition    = ${if eq{$sender_verify_failure}{}}

--
Jeremy McSpadden
Flux Labs, Inc | http://www.fluxlabs.net<http://www.fluxlabs.net/> | Endless Solutions
Office : 850-250-5590x101<tel:850-250-5590;101> | Cell : 850-890-2543<tel:850-890-2543> | Fax : 850-254-2955<tel:850-254-2955>