DNS caching service (dnscache)

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Article Information

This article applies to the following ZCS versions.

ZCS 8.6 Article ZCS 8.6ZCS 8.5 Article ZCS 8.5

DNS caching service (dnscache)

Starting with Zimbra Collaboration 8.5 and later, there is now a DNS caching service available for installation. It is specifically targeted for MTA nodes, and could be perfect for Single-Server Installations. Three of our supported features are raly heavily on DNS lookups:

  • DKIM verification
  • SpamAssassin Scoring
  • Postfix RBLs for spam blocking


However, remote sites that provide the SpamAssassin scoring and Postfix RBLs do *not* like heavy DNS traffic overloading their servers for some reason. Prolonged over-use of their DNS systems will in fact get your MTAs blacklisted from using those services, severely reducing the effectiveness of said services.

How it works

How to enable it

To ensure our clients do not have their MTAs blacklisted the DNS caching package is now part of ZCS. General setup:

   Answer [Y] to install zimbra-dnscache
   When prompted, list the IP(s) of the sites local DNS servers 

The installer will automatically reconfigure the DNS cache as the primary resolver for the OS.

NOTE: SHOULD NOT BE INSTALLED ON SYSTEMS THAT ALREADY HAVE BIND OR OTHER DNS SERVICES INSTALLED. Instead, the client should configure such servers to also act as a DNS cache.

Testing the DNS caching service (dnscache)

Identified Support Issues

Verified Against: Zimbra Collaboration Suite 8.5 Date Created: 08/04/2014
Article ID: https://wiki.zimbra.com/index.php?title=DNS_caching_service_(dnscache) Date Modified: 2015-05-16

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Wiki/KB reviewed by SME1 SME2 Copyeditor Last edit by Jorge de la Cruz

Reference: https://bugzilla.zimbra.com/show_bug.cgi?id=83670

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