[Exim] Excluding domains from sender callout

Hi,

How can I exclude certain domains from being checked during the callout
phase? I have in my exim configuration:

domainlist no_callout_domains = websrv.secunia.com

   require verify        = sender/callout=15s,defer_ok,random
           !domains      = +no_callout_domains

But when I test it with exim -bhc 1.2.3.4 with the address
nobody@???, it still performs the callout. I don't know
where I'm wrong because exim's ACLs are still new to me.

--
Regards,
wK (www.doubleukay.com)