After our recent post Introducing more control over Direct Send in Exchange Online, there have been more questions about scenarios that are not actually Direct Send such as senders being able to igno...
Updated Aug 07, 2025
Version 7.0
Blog Post
Have there also been changes to the security restriction options available for mail connectors from partner orgs?
I can see the security option "reject if not from these IPs" on connectors that already had the option available. But when I try to modify other connector security options or even create a new connector, that security option is no longer present. I believe this was confusing because of the IP option in the Authenticating sent mail step also exists.
Now "verifying IP address" in the Authenticating step is now the only way to restrict via IP with partner to O365 connectors. But if RejectDirectSend=false, this only IP setting is not sufficient.
New connector steps:
Existing connector made over a year ago with IP security restriction:
Mithun_Rathinam
Microsoft
MicrosoftabaDE , Go with these options