Situation

You would like to store an e-mail server – for example for viflow DMS – but use Microsoft Exchange Online. Since this is not supported, you need an SMTP relay.

Solution – Set up SMTP relay for Exchange Online

1. Open Server Manager and navigate to Manage – Add Roles and Features.
2. Activate the SMTP Server entry under Features and run the installation.
   
3. After installation, open Internet Information Services (IIS) Manager (6.0).
   
4. Under Local Computer, right click on SMTP Virtual Server #1 and open Properties.
   
5. On the Access tab, under Relay Restrictions, click the Relay … button.
   
6. In the Relay Restrictions window, click the Add button.
7. Select Single Computer and enter the localhost IP address.
   Confirm the entries with OK.
8. Go to the Delivery tab and click the Outbound Security … button.
   
9. Activate basic authentication, enter the login data for sending emails with username and password and check the box for TLS encryption.
10. Confirm with OK and click the Outgoing Connections … button.
11. Enter port 587 as TCP port.
    
12. Confirm with OK and click the Advanced … button. 
13. Enter the mail server smtp.office365.com in Smarthorst.
14. Confirm with OK, apply the changes to the settings and close them with OK.
    This completes the configuration of the SMTP relay.
    
    Entering the e-mail server data, e.g. in viflow DMS, then looks like this:
    Server: localhost
     port: 25
     TLS: false
     Users: –––
     Password: –––