This article applies to recent versions of SmarterMail. View articles for SmarterMail 15.x and earlier.
 

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:

  1. Log into SmarterMail as the system administrator.
  2. In the menu at the top, click the Settings icon.
  3. In the menu on the left, click Protocols. The protocol settings will load in the content pane.
  4. On the SMTP Out card, switch the Enable DNS Caching toggle to ON.
  5. Click Save.

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

 

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Perhaps elaborate on why one would enable this option, pros/cons...
MARK MITCHELL (June 5, 2016 at 4:16 PM)
Hey Mark! The purpose of DNS caching is to speed up the delivery of messages. When enabled, all DNS query results are stored for a period of time. This decreases the query load placed on the authoritative servers and ensures that answers to these queries are stored locally for rapid querying. (I updated this article with that information.) A disadvantage of using DNS caching is that if a domain changes MX records, SmarterMail will try to deliver to the cached MX record instead of the new.
Andrea Rogers (June 6, 2016 at 3:45 PM)

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