Author: Bernhard R. Erdmann Date: To: exim-users Subject: Re: [Exim] can't get to run SMTP callback
> Callout will only be done if verification succeeds, and the router that > accepted the address sets up the remote hosts. Your router causes
> verification to fail. So Exim won't do a callout for any addresses that
> matches that router.
Many thanks for your excellent comments in the source code of Exim. They
gave me a clue what's going wrong with my setup.