On Fri, Feb 10, 2017 at 05:37:36PM +0000, Gomes, Rich wrote:

> It's going against MS AD, I am sure indexing is configured correctly there.

That rather depends on what query you're sending, and how AD is
configured.  Your confidence does not inspire confidence. :-(

> What can I do on my postfix server to alleviate this issue?

    * Use queries that are implemented efficiently on the AD side.

    * Use LDAP servers that are not already struggling with processing
      other queries.

    * As appropriate specify the "domain" attribute in the LDAP table
      definitions to avoid looking for data for domains that you don't
      use in LDAP.

    * Post your Postfix LDAP table definition (sans passwords).

-- 
        Viktor.

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