On Tue, Nov 29, 2005 at 07:38:12AM -0500, Scott Kitterman wrote:
On 11/29/2005 07:16, paddy wrote:
On Tue, Nov 29, 2005 at 11:53:25AM +0000, Julian Mehnle wrote:
<snip>
Only if the remote MTA cannot be reached should the
message be accepted and stored for later delivery.
yes, a key reason why its hard to see why bounces should go away entirely.
Yes, but very much a corner case at most. Border MTAs should have all the
information necessary to determine if a message is acceptable to deliver
(e.g. list of valid users). The only time this might be appropriate is in
the case of multi-hop e-mail accross administrative boundries.
Actually now I look at it again a proxy can just pass a 4xx back.
Even a simple call-out could do so.
I suppose that's no use in the genuine store and forward scenarios like
client connects twice a day for fifteen minutes. But, as you say,
having a list of valid/invalid users is an option there.
A better example of how protocols and proxies can interact badly might be
ftp, nat and ssl, perhaps.
Regards,
Paddy
--
Perl 6 will give you the big knob. -- Larry Wall
-------
Sender Policy Framework: http://www.openspf.org/
Archives at http://archives.listbox.com/spf-discuss/current/
To unsubscribe, change your address, or temporarily deactivate your
subscription,
please go to
http://v2.listbox.com/member/?listname=spf-discuss(_at_)v2(_dot_)listbox(_dot_)com