SMTP Authentication questions

Hi there.
Currently moving from a FreeBSD server using sendmail to SL 10.6 server.
I'm having difficulty figuring out on how to do it from the Server Admin interface.
What I would like to achieve is:
*People on local network (e.g. from 192.168.0.0/24) can send email without authentication (so mail server act has an open relay for local machines).
*When using a non encrypted connection , only accept the CRAM-MD5 and Kerberos authentication method
*When using encrypted connection (via TLS or SSL), accept LOGIN, PLAIN, Kerberos and CRAM-MD5.
Is there a GUI to configure this, or do I have to manually edit configuration files?
I'm expecting a very curious behaviour, if I configure mail to accept a given security/authentication mode, if I unselect it, then click save. When I check any options again then save, 2-3s later, the option unchecks itself automatically... Very weird.
Any help greatly appreciated.
Jean-Yves

in particular squirrel mail refuses to send email once I set SSL to "require".
Correct. Squirrelmail is typically on the same box as the mail server and uses the localhost address (127.0.0.1). No authentication required. You need to set SSL to "Use" not "require" (no SMTP from unknown Internet hosts will use SSL anyway, so it cannot be "require")
There are plenty of dumb clients that do not support smtp via authentication.
Outside of squirelmail, virtually all modern e-mail clients do support smtp authentication. Some might not support SSL, or SSL with self-signed keys. But they should all should support basic SMTP auth.
Too late for 192.168.x, been using it for over 10 years and there are easy way to get
around the VPN issue, I just allocate an IP in 192.168.100.x and route that subnet.
I thought I was cool by using 172.22.1.0 /24 at home... until my employer started using 172.22.0.0 /16 and shipped a policy forcing all the /16 traffic to use the tunnel. Whenever the VPN was up I could no longer print at home. I ended up using another otherwise unused class A network (yes there are a few left). It will work fine, until you need other local resources when the tunnel is up and there is an address conflict.

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