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SBS 2003 not receiving a specific email

Good day,

I have a problem emailing out of an Elastix machine. or the problem could be receiving emails on an SBS 2003 server.

Basically, If I send an email to myself (user@domain1.net.au) from the Linux console I can receive it fine. However, if I send an email to user@domain2.com.au the email is not received.
The Elastix machine and the server (Exchange / SBS 2003) for domain2.com.au are in the same LAN and share the same Pfsense firewall.

If the email to domain2.com.au is sent from a remote Elastix server it is received.

So i guess the issue must be happening because the Elastix server i need to configure is on the same local network as the domain2 SBS.

On the firewall, I've forwarded ports 25 and 100 to the SBS server.

What am I missing?

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1 Solution
Malli BoppeCommented:
Can you clarify the below things.

domain1.net.au and domain2.com.au  are they both hosted on SBS server.
Does Elastix machine host email as well.
tom_szaboAuthor Commented:
mail.domain1.net.au - Windows Server 2003 STD running Exchange Version: 6.5.7638.1

mail.domain2.com.au - Windows SBS 2003 with Exchange Version: 6.5.7226.0
The Elastix machine (CentOS release 5.3) runs postfix. It just sends emails with Hylafax; it attaches the faxes to an email and sends them automatically to a nominated address.

Malli BoppeCommented:
so from the SBS LAN can you telnet to mail.domain1.net.au  on port 25.
tom_szaboAuthor Commented:
We have finally solved the issue.

To send emails, the Elastix server was pointing to domain2.com.au, which has tha same public IP address.

The Elastix server has as its DNS server the SBS 2003.

The solution was to include a DNS record on the SBS 2003, asociating mail.domain2.com.au with the LAN IP for the Elastix server.

Thanks for the help.
tom_szaboAuthor Commented:
This was the solution that we tested and solved the issue
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