[Exim] How to deliver without looking for dns

Hi!

I've upgraded from debian2.2 to testing with exim 3-22.4 Now I have a
problem with delivering mails from my pc. I have only a dialup connection
and configured exim for this problem. Every time I send a mail it takes
about 30 seconds before I can go on with my mailprogramm. It seems that exim
tries looking for the isp.
Before upgrading all went fine.
where can i change this behaviour?

Thanks....Thomas
--
E-Mail: thomas_wegner@???