[exim] Relay for certain virtual Mailaccounts

Hello!



I am new to exim. I set up Exim to work with Courier and Mysql-DB.
Everything works fine, but I have to allow Relay for some Hosts, which do
not have static IPs and cannot authenticate via SMTP. How can I tell exim to
allow Relay Mails for specific Domains or Email-Adresses? Is this possible?



Thanks in advance!





Elmar Leirich