What is DKIM
DomainKeys Identified Mail (DKIM) is an email authentication method designed to detect modifications in the content of email messages after sending.
DKIM allows the receiver to check that fields contained in an email, claimed to have come from a specific domain, were modified by an unauthorized part. It achieves this by affixing a digital signature, linked to a domain name, to each outgoing email message.
From the DKIM page, you can add your DKIM keys in LetsDMARC by following the below steps.
Click Add at the upper right corner and select if you want to add DKIM, you can also add CNAME if you need to
After selecting DKIM, select your domain and optionally turn on Discover values from published record to retrieve all information's already published
Next, enter your DKIM selector name. For example, esgkey2 and click Next
If you opted in and DKIM records are been discovered, the following pages will be already populated and you should. simply click Next
Otherwise, select the algorithm type you used to create the key and click Next
On the next page, as before, your DKIM key will auto-populate if you opted for discovery. Otherwise, insert the public part of the key you want to publish
Click Next, in the summary page, click Save
Eventually, if this is the first record you're publishing for the domain, you must verify ownership of the domain by publishing the below TXT record to your DNS. Please add the following entries to your DNS.