>>The external IP from the firewall *is* your MX record. :)
>>
>>Internally, your mailserver has a private IP, such as 192.168.0.1. That's
>>all it knows about. When it sends an E-mail to another server
>>(mail.declude.com for example), the firewall translates the 192.168.0.1
>>to your public IP address. When mail.declude.com sends you mail back, it
>>looks up your MX record, which leads us to your public IP address. Your
>>firewall then translates that public IP address back to 192.168.0.1.
>
>What about internally, say from a mail script on a web page. Will it
>bounce off of the external IP and back into the internal network?
That's more of a network design issue.
If both the mailserver and webserver are on internal IPs (IE behind a
firewall), the mail script should connect using the internal IP
address. If the network (routers, firewalls, etc.) support it, you could
use the external IP address.
-Scott
---
Declude: Anti-virus, Anti-spam and Anti-hijacking solutions for
IMail. http://www.declude.com
---
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