The owner of the domain name being used for a DKIM signature is declaring that they are accountable for the message. This means that their reputation is at stake.
Receivers who successfully validate a signature can use information about the signer as part of a program to limit spam, spoofing, phishing, or other undesirable behavior, although the DKIM specification itself does not prescribe any specific actions by the recipient.
Sender Policy Framework (SPF) is a simple email validation system created to detect email spoofing by providing a mechanism to allow receiving mail exchangers to check that incoming mail from a domain comes from a host authorized by that domain administrators. The list of authorized sending hosts for a domain is published in the Domain Name System (DNS) records for that domain in the form of a specially formatted record. Email spam and phishing often use forged sender addresses, so publishing and checking SPF records are considered anti-spam techniques.
UltaHost Shared Hosting plans available here: https://ultahost.com/shared-hosting are created with DKIM and SPF records by default. Still, if you are using our high-end Cloud VPS or Dedicated servers, you can request the activation of SPF or a DKIM record for your domain by submitting a ticket to our Technical Support Team.