Performing a DKIM lookup involves querying DNS records to retrieve the public key associated with a domain. Here’s a simple step-by-step process:
Identify the domain and selector used in the DKIM signature. Construct the DNS query using the format: selector._domainkey.domain. Use a DNS lookup tool or service to perform the query and retrieve the public key.
Several online tools like MXToolbox offer easy DKIM lookup services.