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If your domain is provided by a G-suite domain host partner you don’t need to add your DKIM key to the DNS record at your domain host. Gmail generates the domain key and adds it to your domain's DNS records.
You must be signed in as a super administrator in order to be able to generate DKIM.
After creating your G Suite account and turning on Gmail, you have to wait 24–72 hours before you can generate a DKIM key.
In your Google Admin console (at admin.google.com)...
Go to Apps > G Suite > Gmail or follow the search request below.
a) Type DKIM and Go to DKIM authentication.
b) On the Authenticate email page in the drop-down list select a domain for DKIM authentication.
If you have multiple domains, make sure you select a domain you want to enable DKIM authentication. Otherwise DKIM authentication may fail for your domain.
3. Click Generate New Record to generate DKIM record.
4. Select DKIM key bit length 2048 and click Generate.
5. After the generation is complete click the Start Authentication button.
In most cases email authentication process takes up to 48 hours to verify. If you encounter a message like this, make sure you entered the correct DKIM text-record into domain provider's settings and come back later. Then, you can again click the Start Authentication button to enable DKIM.
Contact us at [email protected] if you have any questions or are looking for additional information or support.