7.1 Sending Domain
Sending domains will match the FROM address of the email campaigns and will add proper DKIM signatures to the email headers, thus increasing the chances for the emails to land inbox. You can verify the authenticity of the domain used in the campaigns FROM email field.
The verification process is very simple, which involves adding two DNS TXT records for the domain used in the FROM field of a campaign. Once a sending domain is verified, all future campaigns sent from the verified domain will be DKIM signed and will pass SPF validation, thus giving a higher inbox delivery rate.