--On Saturday, October 27, 2012 11:58 AM -0500 Stan Hoeppner
<s...@hardwarefreak.com> wrote:
If all the rejected recipient addresses follow some kind of pattern,
maybe a PCRE lookup can help. We don't know enough about it to
suggest anything more.
Actually, we might know enough. The op's primary stated concern is
alleviating load/latency on his LDAP servers. Marlboro college,
according to the website, only has ~300 students. Add
faculty/staff/alumni/etc, and the valid user table shouldn't be all that
large. Cron'ing a nightly, twice daily, whatever works best, script to
pull addresses from LDAP into a Postfix virtual users table may be a
good option here. Query the local table and eliminate LDAP lookups
entirely, making lookups instantaneous. The frequency of the table
update is determined by how often address changes are made to LDAP, and
how quickly mailboxes need to go live according to organizational
policy. Of course, the script can be run manually any time as well.
I'd also examine either tuning the LDAP server, or migrating to a decent
LDAP server. I was able to run all of Stanford University's LDAP traffic
through a single properly tuned LDAP server running OpenLDAP without issue,
which included all email. And that was before the proxy:... bits were
added to Postfix and before back-MDB was added to OpenLDAP (which is
significantly faster than the old BDB based backends).
--Quanah
--
Quanah Gibson-Mount
Sr. Member of Technical Staff
Zimbra, Inc
A Division of VMware, Inc.
--------------------
Zimbra :: the leader in open source messaging and collaboration
