Updates about new features, products, or events, and the process of enrolling in programs.
Hello,Bingo90909
Welcome to the Microsoft Community. Thank you for supporting Microsoft products.
I understand the inconvenience caused with receiving emails even though you've opted out of the Windows Insider Program, and this really shouldn't be happening.
There are a couple of reasons why this may be happening:
First, there may be a delay in system synchronization, and the mailing list may not have been updated in time even though you've opted out of the program;
Secondly, it may be that your account is enrolled in the Insider Program across multiple devices or services, and you need to make sure that all of the associated accounts are fully logged out.
Also, you can try to mark these emails as spam so that the email service provider may reduce the delivery of similar emails.
If the problem persists, you can add the sender to the list of blocked senders.
Please see Block or unblock senders in Outlook - Microsoft Support
You can block emails from specific email addresses or domains from reaching your Inbox. Once added, Outlook will automatically move the email from that sender to the “Spam Email” folder.
Let me know if you have any questions.
Best regards,
Ian Trinh | Microsoft Community Support Specialist