firewall IP as Originating IP for emails

[Steve Cowles]

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On Stardate 6609.08, Mrs. Geeta Thanu said:
| Hi Gurus,
|
| We have our primary DNS , webserver, email server everything inside
| firewall, all natted to WAN IP.
|
| Hence our mails are having the originating IP as firewall's IP ad hence
| some domains are rejecting our mails.
|
| The webserver and email servers IP are same since they both are on the
| same machine.
|
| can anybody please guide me what rules I am doing mistake in firewall and
| how this problem can be solved.

Based on my understanding of the above (nat'd), all outbound packets
from any system behind your firewall *should* have their source IP
address rewritten to the public IP address of your firewall.

Exactly what rejection is being logged by *some domains* as you stated
above? Can you show the DSN or a logfile entry from maillog? Since you
state *some domains* are rejecting e-mail, I suspect that this could be
a DNS PTR record problem, not a firewall rule problem.

- --
Steve Cowles
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