Interesting; is there a straightforward way to drop that traffic entirely?
I think the HRDP IPs and hostnames are probably indistinguishable for
folks outside of the Microsoft ecosystem, and
"OutboundIpPoolName=HighRiskOutboundPool" is some tenant-viewable
internal marker that's not actually embedded in the transmitted message.
Robert
On 11/11/2024 at 06:15, Scott Q. via mailop wrote:
But it's not really the same. Not all providers offer free accounts
which clearly attracts abusers a lot more than paid accounts.
Furthermore, not all providers do this:
"Segregation of outbound email traffic: Every outbound message that's
sent through the service is scanned for spam. If the message is
determined to be spam, it's delivered from a secondary, less reputable
IP address pool named the high-risk delivery pool. For more information,
see..."
"https://learn.microsoft.com/en-us/defender-office-365/outbound-spam-protection-about
<https://learn.microsoft.com/en-us/defender-office-365/outbound-spam-protection-about>"
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