DKIM Configuration


For customers using HENNGE Email DLP and desires to utilize the DKIM feature.


To configure the DKIM setting on HENNGE Email DLP.


This article was last updated in 2019 May.


I have already enabled DKIM on G Suite / Office365, do I still need to set it up on HENNGE Email DLP?
Since HENNGE Email DLP will likely modify the Email in the case of Email Attachment Encryption, this would render the DKIM Signature added in O365/G Suite ineffective. Therefore, if Email Attachment Encryption feature is enabled, we strongly recommend to setup DKIM on HENNGE Email DLP as well.

Is DKIM a necessary configuration?
DKIM Signature is not mandatory, but some stricter Email Servers on the recipient side are likely to check the whether the DKIM Signature is correctly setup. Please assess your situation considering your company's infrastructure as well as Information Security Requirements before this setup.


1. Click on the [ Digital Signature ] → [ DKIM Setting ] in HENNGE Email DLP Admin Console and Choose the [ + ] button beside the [ Selector ].


2. The [ Create DKIM Selector ] Window will appear and please enter the information below.

・Selector Name: Please input any name that you desire for this selector.
・Key Length:  Please choose from [ 1024 Bits ] or  [ 2048 Bits ].


3. Once the DKIM Selector has been saved, please select the selector created, the TXT Record to be added to DNS will appear.

※ By default, the value [ t=y; ] tag will appear in the test mode, when utilizing this feature for production, please remove  [ t=y; ] from the value.


4. After the TXT Record has been registered to the DNS, please enter the domain that the DNS was registered for into the [ Domain Names ] and press [ Apply ].


 ※If the same record was entered for more than one domain, please use Enter (new line) to separate multiple domains.
 Different domains can also each be added to a different selector.


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