You may be wondering why you are unable to use Yahoo, Hotmail, Gmail, and other major domains as your from address in Thrive Marketing Professional. This is because these mail providers (and many others) have set a policy on unauthorized use of their sending domain. This policy is known as DMARC, and it's something that providers are using to help fight spam, phishing, and other means of email spoofing.
DMARC works by leveraging SPF and DKIM as authentication mechanisms to determine if the mailing is legitimate. When senders use these domains outside of authorized systems, mail is typically rejected. This results in poor deliverability.
With DMARC, domain owners can indicate how they want to handle mail coming from their domain that fails these specifications (and how they receive reporting on it). This may not be something you'll need to put in place at your organization, but it is important to understand
------------------------------
Tirza Austin
Senior Manager, Online Community
American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, VA 20191
------------------------------