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Enabling DKIM signing for your domains can help you keep your email content intact throughout the delivery process, barring threat actors from accessing and altering your emails. This helps preserve your identity and eradicate spam and phishing attacks. 
 
These are the steps to generate DKIM keys and publishing in DNS for Nice inContact
  1.  Click the app selector and select ACD.
  2. Go to Contact Settings > Email Domains.
  3. Locate the domain you want DKIM keys for. In the Action column click Initiate.
  4. In the DKIM Tokens (CNAME) window, click Download.
  5. Open the downloaded CSV file and copy the keys to the DNS.
  6. Save your changes. It can take upto 48 hours for your updates to apply.
  7. If the DKIM status column is failed, check your CNAME keys and verify that the correct keys are in your entry, then re-initiate the verification process.