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didn't find an ISA solution but I did find a solution:<br />
I changed the main IP on the WAN interface to mail.domain.com<br />
quick &amp;&nbsp;simple...
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didn't find an ISA solution but I did find a solution:
I changed the main IP on the WAN interface to mail.domain.com
quick & simple...

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Absolutely. ISA would not affect this IP address unless you had NATted the IP address assigned to the MX record to the external IP address of the ISA server. Your change is the correct one.<br />
<br />
Regards<br />
<br />
Keith
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Absolutely. ISA would not affect this IP address unless you had NATted the IP address assigned to the MX record to the external IP address of the ISA server. Your change is the correct one.

Regards

Keith

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A request has been made in CS to PAQ this question. I or another moderator will finalize this question in 4 days if there are no objections from the participating experts.<br />
Since the asker posted the solution it will be &nbsp;PAQ/Refund of points<br />
<br />
Thank you.<br />
kb<br />
Experts Exchange Moderator
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A request has been made in CS to PAQ this question. I or another moderator will finalize this question in 4 days if there are no objections from the participating experts.
Since the asker posted the solution it will be  PAQ/Refund of points

Thank you.
kb
Experts Exchange Moderator

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simple problem (hope for simple solution...):<br />
outbound mail show the company's main IP in the header<br />
since some spam filters block mail if they can't resolve the source IP, <br />
I must find a way to attach the correct mail.domain.com IP to the emails headers
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simple problem (hope for simple solution...):
outbound mail show the company's main IP in the header
since some spam filters block mail if they can't resolve the source IP, 
I must find a way to attach the correct mail.domain.com IP to the emails headers

ISA 2004 show wrong source IP for outbound mail

Software firewalls, also known as host-based firewalls, provide a layer of software on one host that controls network traffic in and out of that single machine. Most operating systems now include firewall software, but many available software firewalls include central distribution, antivirus systems and disaster recovery.