This document explains how you can send mail from a vendor-hosted application or system using a custom unc.edu domain without triggering Office 365’s anti-spoofing system.
Decide on the domain name from which you want to send. For example, the domain name for firstname.lastname@example.org is “qualtrics.unc.edu”.
If there is no domain with the name you have chosen, and no TXT record that conflicts with your request, open a Help Request with ITS Networking requesting the domain be created in DNS.
Networking will have you sign a Memorandum of Understanding (MOU) as part of the process (Note: you may scan and upload the signed MOU to the Help Request).
Also ask Networking to create a TXT record in DNS for the domain. Include the SPF record that your vendor wants you to use. It will look something like this:
“v=spf1 include:_spf.qualtrics.com ?all”
Check out Microsoft's FAQs for Office 365 (https://support.office.com/). Microsoft also has some great training videos you can watch to become familiar with using Office 365 applications. Please visit the Office Training Center.