Email headers are used to evaluate an email’s deliverability, including the route it took to arrive in your account and, sometimes, spam ratings. If you need to send headers from an email you received, this is one way to do it if you have an O365 account.
- Log into O365 Web Mail: https://outlook.office365.com (make sure you use email@example.com as your username.)
- Locate the email message in your O365 webmail and open it.
- Click the 3 dots in the top right corner and select View->View Message Details.
- When that window pops up, copy the message detail text and paste it wherever you’d like to share it.