On Tue, 17 Dec 2002, Kostur, Andre wrote:
> Let's assume that I have a site where I'm using Exim as a mail hub (all MXes
> point to it), and it may then forward incoming emails to other hosts which
> will be the final destinations. How can I have Exim reject emails (as a 5xx
> error response to the RCPT TO command, I want the sender to carry the burden
> of creating a bounce message) to unknown email addresses? Note that Exim
> itself doesn't have knowledge of the usernames, so I'm guessing that one
> would have to write some sort of router which will go ask the final
> destination about that email address.
As long as you are using Exim 4, you can do this kind of check using
callouts on recipient verifications in the ACL.
--
Philip Hazel University of Cambridge Computing Service,
ph10@??? Cambridge, England. Phone: +44 1223 334714.
