Office 365 - Approve Constant Contact to Send Email from My Domain
This document will provide the steps necessary to set up custom domain authentication for Constant Contact, approving Constant Contact to send email from addresses in your organization's subdomain (e.g. mydomain.wisc.edu).
Note: approving a third-party email vendor to send email as/from @wisc.edu addresses (e.g. firstname.lastname@example.org) is not permitted. Only approve third-party email vendors to send email as/from addresses in your subdomain (e.g. email@example.com).
Constant Contact provides publicly available documentation on setting up custom domain authentication:
If you need assistance in taking the above steps, please email firstname.lastname@example.org.