David Brodbeck wrote:
On Tue, 1 Jun 2004, Daniel Taylor wrote:
Option 1:
Live forward. Attempt delivery to the Exchange server before reporting
acceptance back to the originating server.
Option 2:
Use a directory service. Validate the recipient address through
your internal directory service before accepting it in Exim.
Thanks. Both are excellent ideas, but I'm not sure yet if Exim can do
them. I don't think Exim 3.x could, but we recently upgraded to 4.x and I
haven't had time to really pour over the documentation in depth yet. 4.x
added support for ACLs that can be evaluated during the SMTP dialog, so I
suspect I might be able to have it talk to Exchange's LDAP service that
way.
If anyone has done this, please share. :)
You could use LDAP to fetch a complete list of all valid Exchange
addresses once a day, and configure Exim to reject invalid addresses. We
do this, as we have an Exim system performing virus and spam scanning
sitting in front of our internal mail system. Our internal mail system
does not use Exchange, but the principal is the same.
Adrian Barker,
University College London.
-------
Sender Policy Framework: http://spf.pobox.com/
The Inbox Event at the Marriott San Jose features SPF.
June 2: Email Accountability Symposium (free)
June 3: SPF Strategy BOF (free) where industry will coordinate deployment
timeline
Times: 6:30pm - 8pm, both sessions. http://www.inboxevent.com/
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