Sending Email Through Office 365 on Pantheon.
Campus IT setup service account and allowed send from
noreply@sog.unc.edu (primary address)
I am using plugin Easy WP SMTP, I was unable to get others to work.
Host: smtp.office365.com
Port: 587
Encryption: STARTTLS
SMTP Authentication: Yes
Username and password are in last pass under Office 365 Email Service Account