[exim] Custom message on accept

Hello,

Is there a way to put a custom message when the ACL accepts it?

For example, I would like to have a behavior like this one:
MAIL FROM:<renaud@???>
250 OK <renaud@???> ACCEPTED

instead of the traditional "OK".

I tried
accept  domains = +relay_to_domains
        message = somewhat different from stock

But I still got the standard "OK".

I'd like to do this to mimic sendmail behavior because a proprietary
program expects this syntax.


Thanks