Setting up a DKIM record involves generating a public/private key pair. The public key is added to your DNS as a TXT record, and the private key is used by your email server to sign outgoing emails. Here is an example:
default._domainkey.example.com IN TXT "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBg..."
In this example, 'v=DKIM1' denotes the version of DKIM, 'k=rsa' specifies the key type, and 'p=' contains the public key.