Follow these steps to set up DKIM:
- Log into SmarterMail as the Domain Administrator.

- Click the Settings icon.
- Expand the Domain Settings folders in the navigation pane.


- On the Options tab, select the Enabled DKIM Signing checkbox.
- TXT record NAME and Value to your DNS manager
How to add it to Run IT DNS manager (Please check with your DNS manager provider if not using RUN IT )