Sendmail behind firewall Solaris 9

I have a number of servers behind a software firewall.
All of the servers are defined only in local /etc/hosts files with addresses similar to 192.168.0.n and I would like to route all root email from all of the servers to one server 192.168.0.99 in this example.
I would prefer not to open up the firewall to incoming mail.
/etc/nsswitch.conf for hosts indicates: files dns
None of the servers will successfully have nslookup return a valid IP address as nslookup returns the public networks ip addresses in front of the firewall (usually a 129.* publically accessible subnet address) for all name lookups.
This worked on Solaris 8 but stopped working after a Live Upgrade to Solaris 9.
Any thoughts would be appreciated.
I assume I need configuration changes on the 'sending nodes' as well as the receiving system.
Wouldn't this be a standard configuration for systems behind a firewall?

SInce I had been able to get this working in Solaris 8
I assumed that it would be possible also in 9.IIRC Sun changed philosofi towards sendmail between Solaris8 and Solaris9
Sun had themselves hacked the open source sendmail up until and including solaris8.
In Solaris9 it is almost Vanilla sendmail that is shipped. Therefore you have two
choises : Either set up DNS to serve the adresses you need or Write you own
"LOCAL RULE 0 " rule set to include in your sendmail Macro ( M4) config file.
if you include something like the below in you sendmail Macro config file and
do the m4 generation run you will override the part of sendmail that wants to do
DNS Resolution for each of the target hostnames you specify. ( replace host1.com
with you values )
LOCAL_RULE_0
R$+<@host1.com> $#esmtp $@[192.168.0.99] $: $1<@host1.com>
R$+<@host2.com> $#esmtp $@[192.168.0.98] $: $1<@host2.com>
there MUST be a single TAB after the first Leftmost part of the line.
( this forum only displays a single space. i.e. :__ @host1.com>TAB$#esmtp )
Regards
//Lars

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