Enable DNS Caching

DNS Caching is a method used to speed up the delivery of email messages. When enabled, all DNS query results are stored for a period of time determined in the configuration (time-to-live) of domain name records. This decreases the query load placed on the authoritative servers and ensures that answers to these queries are stored locally for rapid querying. NOTE: DNS caching is disabled by default for new installations.

Applies to SmarterMail 8.x - 15.x

Follow these steps to enable DNS caching:

1. Log into SmarterMail as the system administrator.
2. Click the Settings icon.
3. Click Protocol Settings. The protocol settings will load in the content pane.
4. Click the SMTP Out tab.
5. Click the Enable DNS caching checkbox.
6. Click Save.

For more information, please refer to the SmarterMail Online Help.

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