Announcing: Office 365 endpoint categories and Office 365 IP Address and URL web service

Hello aarone,

If you want to see where Office 365 sends email from today, you should use SPF records. You can view the Office 365 SPF record with this Windows command prompt command:

nslookup -type=txt spf.protection.outlook.com

The IP Address ranges that we publish on the web service include these and additional ones that may be used in the future. This is the list that we recommend enterprise customers apply to firewalls so that they do not experience outages due to failure to address changes and so that configuration for all of Office 365 is simplified. This PowerShell command will get you the EOP ranges from the web service:

(invoke-restmethod -Uri ("https://endpoints.office.com/endpoints/WorldWide?serviceareas=exchange&clientrequestid=" + ([GUID]::NewGuid()).Guid)) | ?{$_.category -in ("Optimize", "Allow") -and $_.serviceArea -eq "Exchange" }

Regards,

Paul