Mail Assure Help

Configure Inbound Filtering with Exchange Online (Office 365)

In order to configure inbound filtering for Exchange Online / Office 365 follow these steps:

Add the domain in the web interface

  1. Log in to the Mail Assure control panel as an administrator.
  2. Click on General > Add Domain.
  3. Enter the domain name and click Continue.
  4. Use the auto-detected route if it is correct, otherwise enter the correct Destination route(s) for the domain.
  5. Click Add.

Create a partner connector and rule in Exchange Online to accept filtered mail

  1. Log in to the Exchange Admin Center.
  2. Click on Mail Flow > Connectors and click on + button.
  3. Choose Partner organization as the From and Office 365 as the To, then click Next.
  4. Give the connector a name and click Next.
  5. Choose Use the sender's IP address then click Next.
  6. Add the following Mail Assure delivery IP ranges:
    • 185.201.16.0/24
    • 185.201.17.0/24
    • 185.201.18.0/24
    • 185.201.19.0/24
  7. Ensure that Reject email messages if they aren't sent over TLS is ticked and click Next.
  8. Verify the settings and click Save.
  9. Click on Mail Flow > Rules.
  10. Under Rules, click on the + button and choose Bypass spam filtering....
  11. Enter a rule name (e.g. Disable filtering for Mail Assure).
  12. Choose Apply this rule if... > Senders IP Address is in any of these ranges or exactly matches.
  13. In the specify IP address ranges dialog, add the following Mail Assure delivery IP ranges:
    • 185.201.16.0/24
    • 185.201.17.0/24
    • 185.201.18.0/24
    • 185.201.19.0/24
  14. Ensure that Do the following... is set to: Modify the message properties > Set the spam confidence level (SCL) > Bypass spam filtering.
  15. Click OK.
  16. Click Save.

Change MX record for the domain to point to inbound servers

The default records are:

Hostname Value Priority
@ mx1.mtaroutes.com 10
@ mx2.mtaroutes.com 20
@ mx3.mtaroutes.com 30
@ mx4.mtaroutes.com 40

To use US only routing, replace mxn with mxn-us; for EU routing use mxn-eu; for UK routing use mxn-uk; for CA routing use mxn-ca; for AU routing use mxn-au.