Do these steps to create a rule in Microsoft Exchange Online:

1. Go to the Exchange Admin Center.
2. Click on mail Mail flow in the menu on the left.
3. Click on Rules.
4. Click on add Add a rule.
5. Click on Create a new rule.
6. Enter Zivver: Secure message by <application> + Outbound EG as the name of the rule.
   Repalce <application> with the name of the application.
7. Under Apply this rule if *, select The sender.
8. Under Select one, select is this person.
9. Select the desired sender(s).
10. Click Save.
11. Under Do the following *, select Redirect the message to.
12. Under Select one, select the following connector.
13. Select Zivver Send Connector.
14. Click Save.
15. Under Except if, select The message headers….
16. Under Select one, select matches these text patterns.
17. Click on Enter text.
18. Enter X-Zivver-Transport.
19. Click Save.
20. Click Enter words.
21. Enter ..*. (That is: two dots, one asterisk (wildcard), and one dot).
22. Click Add.
23. Click Save.
24. Click Next.
25. Enable the option Stop processing more rules.
26. Enable the option Defer the message if rule processing doesn’t complete.
27. Click Next.
28. Click Finish.
29. Click Done.

The rule is created but not enabled yet. Make sure the priority of all existing rules is correct. If the sent message needs to be processed by other rules first, ensure that the rule created for the Encryption Gateway has a lower priority.

Since the rule is not enabled yet, no outbound message that matches the filter will be submitted to the Zivver SMTP server. Enable the rule once all priorities are correctly set.