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03 Troubleshooting
Server
Disabling exhaustive name lookups to gain performance

By default, the mail router configuration option "Exhaustive lookup" -- available on the Router/SMTP - Basics tab of a Configuration Settings document -- is disabled. If you keep this default setting, once the router finds a name it doesn't continue its search to other directories. Disabling exhaustive lookups is used to improve router performance.

By design, disabling "Exhaustive lookup" does not apply to a directory catalog. After searching the primary Domino Directory, the router continues its search to the directory catalog even if "Exhaustive lookup" is disabled because it can find all the names quickly in one database (rather than having to take the performance hit of searching multiple secondary directories).

The router returns a delivery failure if it looks up a name in the directory catalog that corresponds to more than one directory entry and the Mail server, Mail file, and/or Domains are different for each entry. To avoid these delivery failures when the two entries actually represent the same person (for example, when someone's name and directory location within the organization has changed but you want to allow people to address mail using the original name), make the entries in the Mail server, Mail file, and Domain fields identical for each entry.