> We run Postfix in front of an Exchange 2003 box. I currently run a cron > job every hour to pull a list of valid email addresses of users (and all > associated aliases) and Public Folder email addresses down from the > Exchange box. > Whilst we don't add/remove addresses terribly often, it's a guaranteed > way of making sure that any new accounts/email aliases are accepted > quickly if they're setup whilst I'm not here. > I wondered how simple/difficult (I'm not new to Linux but would count > myself as a "know what I need to get by" type) it would be to have > Postfix do an "on the fly" ldap query and just have it cache the results > for a period of time rather than each and every hour have it download an > entire list of email addresses?
It is very simple; Postfix supports LDAP natively, our Postfix queries our DSA for all the maps. It won't cache however. If you need caching you should run a local OpenLDAP server and proxy the queries. > I've had a look at the docs and Google and I'm struggling to find a "one > size fits all" guide. There are no "one size fits all" guide because one size does not fit all. But the Postfix LDAP guide should cover everything you need to know; there is nothing special about AD.
