Can't help with any of the Kerberos bits, but
On 01/05/2013 12:10 AM, Andy Bennett wrote:
> Is there a way for the client to authenticate to the smarthost and then
> pass on the authorized user? For example, mail sent by local users would
> end up being delivered authorized as that user on the relay in the same
> way as it currently is when they do SMTP AUTH directly to the submission
> service.
Yes:
http://exim.org/exim-html-current/doc/html/spec_html/ch-smtp_authentication.html
and the very last paragraph.
--
Jeremy