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Using a DKIM key on multiple Messaging Gateway's.


Article ID: 172373


Updated On:


Messaging Gateway


Using the same DKIM key on multiple Messaging Gateways that support the same domain.


The control center operation to create a DKIM key does not allow export for use on other control centers.


Messaging Gateway


To use the same DKIM key on multiple control centers, you have to create the DKIM key from the command line and import it on each control center you want to use it on.

  1. Login as support to the Messaging Gateway appliance. (If you do not know how to login as support, open a case and reference this article ID)
  2. Run the following command to create a DKIM key (2048 byte key length):
    1. openssl req -newkey rsa:2048 -nodes -keyout /tmp/domain.key
  3. Run the following command to convert the key to PEM format:
    1. openssl rsa -in domain.key -out domain-rsa.key
  4. Copy "domain-rsa.key" to your desktop with WinSCP (protocol SCP, port 22 and the support user)
    1. WinSCP is free and downloadable at
  5. Import to the SMG (Administration > Certificates > Domain Keys).
    1. Browse to the file and give the key a display name.
  6. Repeat step 5 for any additional control centers.