How to configurate DA using external mail anti-virus agent

[Chickenwing]

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I have a external mail anti-virus (MessageLabs)
Originally, my incoming / Outgoing mails will relay by MessageLabs
e.g 1. I send out a mail, mail server will use 25 port connect to MessageLab
and then messageLab help me send it out
2. When someone send a mail to me. the mail will send to MessageLab
first and then MessageLab will connect to Mail server at port 25.

So how can I configurate it in DA to do this Thank you!!!

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The MessageLab specified this:

5. Changes to be completed only AFTER full MX Record propagation are complete.
a firewall in place, please place the following restrictions on your

6. If your organization has, (NOT your mail server). If your organization does NOT have a
organization firewall firewall, you will need to make the restrictions on the mail server itself.
Accept connection from 216.82.240.0 (subnet mask 255.255.240.0)
Accept connection from 195.216.16.211 (subnet mask 255.255.255.255)
Deny connection from 0.0.0.0 (subnet mask 0.0.0.0)

7. If you do not deny connections from other hosts, your organization runs the risk of infection by
viruses that send themselves directly to an IP address.
***Please note that ONLY port 25 a.k.a. SMTP traffic must be !§locked down!‥ to accep
from MessageLabs IP addresses noted above***

Step 3: Outbound Configuration (optional)
8. Please forward this section of instructions to the person/organization that is responsible for the
configuration of your company!|s SMTP servers.
9. Configure your organization!|s SMTP serverto send e-mail out via the Default Mail Route
cluster5.us.messagelabs.com

 

[nobaloney]

Set the MX record for the domain(s) served by MessageLab as they tell you.

Then firewall off port 25 traffic from your server unless it comes from their IP# as they tell you.

If you want mail from your server to go outbound from them search exim.org for information on how to set up a "smarthost" for outbound email.

And if you want your users to be able to send out email through your server, tell them to use port 587 instead of port 25.

Jeff