Re: [exim] ACL rewrite

W B Hacker wrote:

Correcting my own post....

*snip*

> Routers are the first 'as shipped' place that Exim processes traffic in
> a 'fully' recipient-unique manner. smtp protocol doesn't support it any
> earlier (unless you have courier-mta at BOTH ENDS of session, but that
> is not Exim relevant).

Clarifying:

Courier-mta's Extended Data Reply (EXDATA) occurs as an extra step
*during* the smtp session, but *after* the conventional DATA phase, when
it returns to a per-recipient handshake before finalizing message
acceptance/rejection.

While the technique has been proven in long-term courier-to-courier use,
it is not (yet) present in other MTA's, so both parties have to be
courier-mta AND have the feature optioned-on AND take advantage of its
advertisement in the EHLO menu.

Dumb additions to RFC's are often adopted all-too rapidly, even if MS
fingerprints are all over them.

OTOH, simple things of this sort - that add flexibility and 'JFW' - take
about 10 to 20 years to wend their way thru the RFC process, so it may
be another decade before some form of this becomes widely used.

:-(

Bill