Practical guide. Use only the connection and DNS details provided when your account is activated; .example domains are illustrative.
SPF
SPF identifies systems authorized to send for a domain. Review the existing record before changes and avoid multiple SPF records.
DKIM
DKIM verifies a message signature using a key published in DNS. The selector and value must come from your provider.
DMARC
DMARC sets a policy for messages that fail authentication alignment. Review reports and legitimate sources before enforcing a stricter policy.