Using DNSBL in Exchange 2013

In order to use an RBL with Exchange 2013 its best to use Hexamail to provide antispam for Exchange 2013.

This has several advantages over any built in antispam protection in Exchange:

  1. Hexamail blocks spam before it reaches Exchange and therefore email doesnt ever burden Exchange
  2. It offers various options per blocklist, such as allow, weight, block and reject so you can configure each blocklist to be as aggressive as you wish
  3. Blocked spam appears in a web based quarantine allowing the admin or users to unblock and whitelist in a single click if required
  4. Blocked spam never reaches Exchange or Outlook so no scripts or malicious links can be activated by end users
  5. Configuration is via a full Windows GUI that allows clear configuration of each list and the action it performs rather than using a complicated command line interface (Powershell)

Hexamail DNSBL support is shown in the screenshot below:



DNSBLs can be used not only for the sending IP address (or IP address in the email headers) but also to reject sender

email address domains:





And also any links (URL hostnames)  contained in the contents:




In every case the email can be allowed, weighted, blocked or rejected/deleted based on the matching list found.


Hexamail can be installed on the same server as Exchange or on another, separate server. Installation is controlled by a really simple to use setup wizard that automatically integrates with Exchange if it is installed on the same machine.

You can download a trial of Hexamail Guard here


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