Configuring Office365/Exchange Online to send mail to ArcTitan is very straight forward. There are two steps:
1) Configure a Journal Rule
2) Configure a connector
Creating a Journal Rule
Go to Compliance Management > Journal Rules. If you have not done so already, you will have to configure an address to which undeliverable journal reports will be sent before you can continue.
Click the plus + icon to add a Rule
The address to which mail will be sent is your Company Tag at the server name. So if you log on to https://arctitan-us1.titanhq.com/company the address to which mail will be sent is:
Select "All messages" for the rest of the options.
Create a Connector
Go to Mail Flow > Connectors. Click the plus + icon to add a Connector.
Select the following:
To: Partner Organization
Enter a name and description. Click Next
Select "Only when email messages are sent to these domains". Click the plus + icon and enter the domain of the email address you entered in the previous step. In this example that would be arctitan-us1.titanhq.com. Save and Click Next.
Select "Route email through these smart hosts". Click the plus + icon and enter the IP or hostname of the ArcTitan server you use. In this example that would be arctitan-us1.titanhq.com. Save and Click Next.
Ensure "Always use Transport Layer Security (TLS) to secure the connection (recommended)" is selected and "Any digital certificate, including self-signed certificates". Click Next.
Verify the settings are correct. Click Next. The settings will next to be validated. Click the plus + icon and enter the Journaling email address you specified in the first step. A test will be performed to ensure mail to that address is accepted by the specified server. Click Validate to finish.
The steps above configure Office365 to:
1) Use a Journal Rule to send a copy of all mail to a specified address (email@example.com), and send any undeliverable Journal Mails to a specified address.
2) Route all mail addressed to @arctitan-us1.titanhq.com to the ArcTitan server.