[Pkg-exim4-users] How to do mandatory SMTP AUTH plus exceptions

[vitko at post.cz]

I'm running exim4 on Debian (Etch) machine, so far I have virtual users in MySQL database
and courier packages for SSL POP3 and IMAP access. Users are authenticated by courier
authdemon. This is very easy to set up on Debian and there are great tutorial out there, too.

My problem is that I need to set up following:

 1) Mandatory SMTP AUTH + TLS for virtual users' MUAs (simply said: no authentication,
 no delivery).

 2) As an exception to rule (1) to enable non authenticated plain SMTP for _one_ specific
 host (ip address). That host (actually antispam and antivir security appliance) will act as
 smarthost and will also route incoming MTA traffic to my server (a kind of "bi-directional
 smarthost").

I guess some customized ACLs should do the trick. I'm still not familiar with debianized exim4
setup (and I'm still learning exim, too), so I'd be really grateful for some examples of (a) _what_
ACLs would I need and (b) _where_ to put them.

I'm using single file configuration (exim4.conf.template).

Thanks a lot in advance!


Vit