Search Knowledge Base: How do I make sure email sent through a third-party tool reach my recipients at UT? If your department is creating a new account with a third-party email tool, such as Emma, Constant Contact, or MailChimp, contact the OIT HelpDesk to start the authorization process to ensure your messages won’t be marked as spam. The Office of Information Technology uses DKIM authentication to identify when emails sent from a UT email address through an outside email service are legitimate. DKIM authentication is a digital signature embedded in the message header that validates that the message was sent legitimately on our behalf. DKIM also helps ensure that the message has not been modified or tampered with in transit.We are using DKIM along with other email security protocols to guarantee that the email sent from a third-party email provider like Emma or Constant Contact is authorized to send email from your UT email account. Need more help?