Rather than performing a directory query for each message that it processes, the IMTA caches directory information that is needed for processing a message. The directory information stored in the directory service is continuously updated. As a result, the directory information in the IMTA-directory cache must be synchronized periodically with the directory information in the directory service. (Note that the cache persists and is updated through an incremental or full dirsync.)
The IMTA supports full and incremental synchronizations.
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Full synchronization - The existing cache is replaced with a new cache completely rebuilt from information in the directory. After the synchronization occurs, the IMTA configuration file is rebuilt and then the IMTA is automatically restarted. |
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Incremental synchronization - The existing cache is updated with user and group entries that were created or modified since the last full or incremental synchronization. The IMTA is not restarted. |
Specifically, during an incremental synchronization, the directory information in the cache is updated with:
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User entries - New user entries and modifications to existing user entries. The cache is not updated with deleted user entries. |
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Group entries - New and deleted members of existing distribution lists and new distribution lists. The cache is not updated with deleted distribution lists or new rules for existing distribution lists. New distribution list is also updated. |
Note - Important! You must schedule each IMTA-directory cache to be fully or incrementally resynchronized at the same time. Not doing so could cause routing loops to occur.
By default, the IMTA-directory cache is fully synchronized every day at 2:00 am and incrementally synchronized every hour. For more information on the IMTA-directory cache, including synchronization schedule planning, refer to "Internet Message Transfer Agent-Directory Cache" on page 11.
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To Reconfigure the Alias Synchronization Schedule |
AdminConsole>IMTA>Full Alias Synchronization (also Incremental Alias Synchronization)
| 1. | Click the IMTA icon on the Admin Console home page to bring up the IMTA property book. |
| 2. | From the Sections list, click Full Alias Synchronization Schedule. |
| The Full Alias Synchronization Schedule section appears followed by the Incremental Alias Synchronization Schedule section as shown in FIGURE 4-3. |
| 3. | Configure the full synchronization schedule. |
| a. | Click the Active button in the Status field to enable full synchronization. |
| b. | Click next to the days on which you want full synchronization to occur. |
| c. | Specify the time at which you want the first full synchronization to occur. |
| d. | If you want multiple full synchronizations to occur per day, use the menu to specify how often the synchronizations should occur. |
| For example, if you specify that full synchronizations should occur every four hours, then they will occur six times per day. |
| 4. | Configure the Incremental Alias Synchronization Schedule. |
| a. | Enable incremental synchronization by clicking the Active button. |
| b. | Specify how often the incremental synchronization should occur. |
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To Disable Full and Incremental Synchronization |
AdminConsole>IMTA>Full Alias Synchronization (or Incremental Alias Synchronization)>Inactive
| 1. | Access the IMTA property book by clicking the IMTA icon on the home page. |
| 2. | Click the Inactive radio button in the full or incremental synchronization section. |
| 3. | Click the Apply button. |