Please add ALL of the delivery IP addresses to your firewall or filters. 

This list was updated and shortened on Jan 1, 2020 with the netblock

These are the IP's that we use to deliver mail to your servers and having an accurate list configured on your firewall or email filtering tool will ensure that your email arrives at it's the destination. 

INBOUND Delivery Servers

These IP's need to be in your firewall to ensure delivery from our network to your email server. 

Delivery Group 1 - ORE1

Delivery Group 2 - ORE2

Delivery Group 3 - ORE3

Delivery Group 4 -  EU1

End of Inbound Delivery Server IP's

These are not required for: 

  • Spam FIltering
  • Phishing Protection
  • Email Forwarding
  • MX Backup
  • Hosted Email
  • Tenant Migration

They are exclusively for outbound email services - 

The attached file - duocircle_inbound_firewall_ip.txt has the full list of IP's that you can use to import into your firewall. Format text, one IP per line in CIDR notation.