How to set MTA to accept mails from hosts on INTERNAL_IP only?

Hello,
I would like to config a messaging server with:
- this mail server will accept incoming mails from hosts on INTERNAL_IP list only without authentication.
- this mail server will accept to send mail for clients with SASL and TLS only, which means, any incoming SMTP connection will be restricted to use SASL and TLS except hosts on INTERNAL_IP list.
/opt/SUNWmsgsr/@msg# imsimta version
Sun Java(tm) System Messaging Server 6.2-7.05 (built Sep 5 2006)
libimta.so 6.2-7.05 (built 12:08:11, Sep 5 2006)
I appreciate if you can help me on this, thanks in advance.
Best regards,
Robert

Hello Shane,
Thanks for your reply.
From the log below, it seems incoming mails will go
to the tcp_local channel first then switch to
tcp_intranet later for sending hosts on INTERNAL_IP
list.
INTERNAL_IP
$(10.1.255.222/32) $Y
$(10.1.255.202/32) $Y <-- sending host
127.0.0.1 $Y
* $N
25-Jun-2007 11:29:18.25 46f1.39c.2830 tcp_local +
O TCP|10.1.255.222|25|10.1.255.202|6442
SMTP
5-Jun-2007 11:29:18.27 46f1.39c.2831 tcp_intranet
ims-ms E 3 [email protected]
rfc822;[email protected] 0694037@ims-ms-daemon
/opt/SUNWmsgsr/data/queue/ims-ms/007/ZZf0B4WiQpxLd.00
<A0D8A3EC90EE42E799706627282BF74C@ibm336> mailsrv
msmail.abc.com ([10.1.255.202])
25-Jun-2007 11:29:18.27 4c9c.0e48.3788 ims-ms
D 3 [email protected]
rfc822;[email protected] 0694037@ims-ms-daemon
/opt/SUNWmsgsr/data/queue/ims-ms/007/ZZf0B4WiQpxLd.00
<A0D8A3EC90EE42E799706627282BF74C@ibm336> mailsrv
My question is, if I modify the tcp_local channel
definition to "mustsaslserver" and "musttlsserver",
will sending hosts listed on INTERNAL_IP also be
blocked?
Thanks for your response. ^^No. All emails to port 25 'hit' the tcp_local channel - there is a rewrite rule to switch messages from a certain IP range (INTERNAL_IP) across to the tcp_intranet channel, at which point the tcp_intranet restrictions apply.
Regards,
Shane.

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