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05.10.2006 at 09:16PM PDT, ID: 21846252
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9.8

PIX 506e reverse lookup MX record with Barracuda

Asked by petererik in Network Software Firewalls, Enterprise Firewalls, Cisco PIX Firewall

Tags: , ,

Hi,

We have a Barracuda spam appliance in our network. As you can see from the configuration of our PIX 506e below e-mail is forwarded to the Barracuda (ip 10.10.10.12) and then from there it is sent on to our mail server at 10.10.10.10. That works fine.

The firewall WAN address is 1.2.3.3
Our MX record for mail.mydomain.com resolves to public ip address 1.2.3.4
A PTR record exists for address 1.2.3.4 to mail.mydomain.com

But when we send mail from our mail server 10.10.10.10 it is sent via the firewall WAN address of 1.2.3.3, and as a consequence reverse lookup fails (it should return mail.mydomain.com). Therefore many mail servers reject our e-mail because of their policy that reverse lookup must succeed.

How do I configure my PIX so that:
1. Incoming mail will go to the Barracuda at 10.10.10.12
2. Outgoing mail from 10.10.10.10 will be sent via 1.2.3.4
3. AND I can still use the https service on the mail server?

This is my current configuration:
name 10.10.10.12 BARRACUDA
name 1.2.3.4 mail.mydomain.com
name 10.10.10.10 MAILSERVER

access-list outside_access_in permit tcp any host mail.mydomain.com eq smtp
access-list outside_access_in permit tcp any host mail.mydomain.com eq https

static (inside,outside) tcp mail.mydomain.com smtp BARRACUDA smtp netmask 255.255.255.255 0 0
static (inside,outside) tcp mail.mydomain.com https MAILSERVER https netmask 255.255.255.255 0 0

Thanks,
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[+][-]05.11.2006 at 07:12AM PDT, ID: 16658589

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[+][-]05.14.2006 at 09:30AM PDT, ID: 16677934

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About this solution

Zones: Network Software Firewalls, Enterprise Firewalls, Cisco PIX Firewall
Tags: ptr, pix, smtp
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Solution Provided By: keith_alabaster
Participating Experts: 2
Solution Grade: A
 
 
[+][-]05.14.2006 at 05:27PM PDT, ID: 16679356

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

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