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.