I still do not follow. 
i know

Why not let your MTA stand on it's own, and act like a MTA, sending  
it's own email.  
it does

The spelling of your rDNS does not matter, 
it does, if its wrong, it bounces back

You can not have two rDNS records, that is not possible, each IP can  
only have one PTR.  
you are wrong, dont worry, happens to us all:

toaster:~# uname -a
Linux toaster 2.6.22-2-686 #1 SMP Fri Aug 31 00:24:01 UTC 2007 i686
GNU/Linux
toaster:~# dig -x 70.88.190.113

; <<>> DiG 9.5.0-P2 <<>> -x 70.88.190.113
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 22234
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;113.190.88.70.in-addr.arpa.    IN      PTR

;; ANSWER SECTION:
113.190.88.70.in-addr.arpa. 3571 IN     PTR    
mail.sercuritycorporation.com.
113.190.88.70.in-addr.arpa. 3571 IN     PTR    
mail.securitycorporation.com.

;; Query time: 21 msec
;; SERVER: 208.67.220.220#53(208.67.220.220)
;; WHEN: Tue Jun 30 19:27:20 2009
;; MSG SIZE  rcvd: 126

toaster:~#


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