Cisco Firewall :: Unable To Send Mails From ASA 5505

Mar 26, 2012

I have 2 subnets bought from my provider and
From my provider a have the following setup:
IP Address:
DNS (1):
DNS (2): 
My IPs are static routed by my provider thought .
On the firewall I have the following set-up:
Outside Interface: security level 0
DMZ interface: security level 50
Inside Interface: security level 100 [1/0] via, outside
Everything works perfectly except when I try to sent an email. The email gets sent (eventually), but afert a long waiting time, 45-60 sec. The connection is opened instally to the server but then just hangs there for 40-50 sec. The problem is that a have an aplication on a server that has to send confirmation emails, and that aplication is limited to a 30 sec timeout for conecting to the mail server, much less then the 45-60 sec that I have now. The mail server is hosted by a data center, it is not in my networks (location).
I have tried deleting the ESMTP inspection, that doesn't work. Pinging my mail server rezults in a average time of 20 ms. And when a do a tracert the hight value in a  hop doesn't usually pass 80 ms, the average is 20-25 ms.
The problem is ONLY when sending emails. Everything else works perfect, including receiving emails from the same server.
My running config is:
hostname ASA-Adisys
enable password 0./39zRW9yhKK/bO encrypted
passwd 2KFQnbNIdI.2KYOU encrypted

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Here is debug log on real time monitoring.
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here's the overview.
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