Cant prevent user sending via high risk delivery pool in O365

Question

One of our users contacts clients on a daily basis, and all his mails are being sent via the HRDP. How do I remove this?

I have sent his email twice to not_******@office365.microsoft.com but no response yet and he is still routing via the HRDP.

How does one prevent outbound spam on O365? As the policy only "notifies" an admin, but nothing further? Cant really call it an outbound spam policy then can you?

Answer 1

Hi Iry

All our domains are in the safe senders list. I have edited SPF records on our DNS etc and we still end up with the same result and have an issue with a user sending out of the HRDP.

Still without a response from the not_junk email address I have sent the sending address and example to though

Answer 2

Hi Jay,

Have you tried the method as my last post? Please contact us if you have any concern.

Thanks,

Iry

Answer 3

Hi Jay,

I understand you have tried twice to send the report. Before you get response from them, I suggest you add the affected user into the white list as a workaround.

1. Go to Exchange admin center(EAC) with admin’s credential.
2. Protection > spam filter.
3. Choose the policy whose the priority is lowest and click allow lists.
4. Add the user into sender allow list and save.

Thanks,

Iry

Answer 4

If you look at my comments in my original post I stated I had done this twice to no avail.

Not really helpful that since nothing happens when I do this

Answer 5

Hi Jay,

Please refer to this article to understand what is High-risk delivery pool used for.

If you can confirm that the emails are legitimate, please report the false positive incidents to the protection team following below steps:

1. Create a new, blank email.
2. Address the email to Microsoft team that reviews messages at ******@office365.microsoft.com.
3. Copy and paste the affected message into that email (as an attachment).
4. Make sure all information, including mail header information is included
5. Click Send.

This action will be updated after 24 hours, please keep patient waiting.

For your reference: https://social.technet.microsoft.com/wiki/contents/articles/36402.exchange-online-troubleshooting-high-risk-delivery-pool.aspx.

For how does office 365 prevent outbound spam? Please refer to EOP Outbound Filter Overview: https://blogs.technet.microsoft.com/ucando365talks/2014/02/25/exchange-online-protection-reporting-customization-and-support-options-streamlining-for-your-organization-emergency-notes/.

Admin can configure the outbound spam policy that send a copy of suspicious outbound emails and send a notification: https://technet.microsoft.com/en-us/library/jj200737(v=exchg.150).aspx.

Thanks,

Iry