Sending email from a multi-function device or photocopier is a common practice. Microsoft Office 365 provides two ways to do this:
- Authenticated SMTP
- Anonymous SMTP
Given that the LAN of most networks is pretty secure we tend towards Anonymous SMTP. Saves wear and tear when passwords are reset and it’s unlikely that a compromised system is going to take advantage of the user domain connection back to Exchange Online to send spam.
Set the copier SMTP to: userdomain.mail.protection.outlook.com
Set the copier SMTP port to: 25
In Office 365 -> Admin -> Exchange -> Mail Flow -> Connectors
Set up a static IP connection to listen for anonymous relay.
