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Adding IP Addresses of Trusted Domains to Office 365 Allowed List

You want to add an IP address to the Office 365 allowed IP list.

Solution

 Use the O365 Admin interface.

  1. Log into https://outlook.office365.com/ecp/ with an administrative user
  2. On the left hand side of the screen select “protection”
  3. At the top of the screen select “connection filter”
  4. Double click on the “Default” profile
  5. On the left side of the Default profile screen select “connection filtering”
  6. Click the + symbol above the Allowed IP Address details box
  7. Input your IP Address(s) in the text box one at a time with the following format and click “OK”.  IP addresses must be specified in the format nnn.nnn.nnn.nnn where nnn is a number from 0 to 255. You can also specify Classless Inter-Domain Routing (CIDR) ranges in the format nnn.nnn.nnn.nnn/rr where rr is a number from 24 to 32. IPv6 address can be input but messages sent from these addresses will not be accepted by the service.
  8. Verify that your IP Address(s) are in the Allowed IP Address section by scrolling through it.
  9. Click Save at the bottom right of the screen

Done

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