Multiple MX records with PIX and ASA5510

I need some help with a setup for email.
Setup
I have a PIX525 and an ASA5510VPN and an internal 2950 router. The PIX does firewalling and the ASA does VPN. Currently all outbound Internet traffic goes through the PIX via the router with this command:
ip route 0.0.0.0 0.0.0.0 10.1.1.2 1
The ASA5510 with its dedicated external IP is used to allow VPN traffic in.
The problem:
I have two separate domain names and two MX records. One (mail.PIX.com)is pointed at the external IP of the PIX the other (mail.ASAVPN.com) is pointed at the ASA5510. I can receive inbound mail through both of the devices. I'd like to mail go out using both domains one through PIX and the other thru ASA. The problem is the router says all unknown traffic go to PIX.
How do I route mail from a host (10.1.1.5) to the ASA5510(10.1.1.4), while sending the mail from host (10.1.1.3) to PIX(10.1.1.2)

I am not folliwing something here. If your gateway for 10.1.1.5 is truly set to the ASA and the ASA has the nat rule on the outside for the 10.1.1.5 address there should be no issue. It sounds like you are sending your traffic back out the pix interface. If your gateway is the 10.1.1.254 address the router will send the traffic to the PIX or redirect you to do so with an ICMP redirect.
Just the simple fact that it's coming out with the wrong external address leads me to beleive that that is the issue.
Any configs/route tables on the servers and firewalls would help.

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>> Next, I would like to insert the data from the temp tables to my production tables which have the same structure but their own IDENTITY keys. Hence, I need to translate the 'temporary' keys to regular IDENTITY keys in my productive tables. <<
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>> This is even more difficult because the system is highly concurrent, i.e. multiple sessions may try to insert data that way simultaneously. <<
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>> We never had a problem with this solution for years until recently when we were running in occasional PRIMARY KEY violations. After some research it turned out, that there were concurrent sessions trying to insert records [sic] in this way. <<
“No matter how far you have gone down the wrong road, turn around.” -- Turkish proverb.
You have been mimicking a mag tape file system and have not written correct SQL. It has caught up with you in a way you can see. Throw out this garbage and do it right.
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