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.
Follow these steps to enable DNS caching:
- Log into SmarterMail as the system administrator.
- In the menu at the top, click the Settings icon.
- In the menu on the left, click Protocols. The protocol settings will load in the content pane.
- On the SMTP Out card, switch the Enable DNS Caching toggle to ON.
- Click Save.
For more information, please refer to the SmarterMail Online Help.