[Mimedefang] backup MX server & checking for valid users

Wed May 14 00:31:02 EDT 2003

--On Wednesday, May 14, 2003 12:10 PM +0900 alan premselaar <alien at 12inch.com>
wrote:

> on my LAN I've got an Exchange server
> on the DMZ I have my primary MX server which does LDAP lookups to the active
> directory to reject uknown users at SMTP negotiation time. (so that way my
> postmaster mail doesn't get slammed with a bunch of "can't deliver to this
> non-existant email address" emails because of all the bunk virus/spam mails.

Cool! How'd you do that? Is a HOWTO available? I'm looking at setting up a
sendmail front-end for Exchange and it would be nice to have that.