
Hi @Frikkie298 ,
This is happening as the setting for the Anti-spam outbound policy in the Security center (https://security.microsoft.com/antispam) is set to block Automatic forwarding.
This is a default setting over time, and you can allow users/mailboxes to de excluded if needed.
Here is my answers to your 1:
Risks and consequences:
- Security: Auto-forwarding can pose security risks if etc. some emails is set to be send to an company's competitor or private email from your work email
- Data Leakage: There is a risk of unintentional data leakage if sensitive information is forwarded to external accounts without proper security measures.
Here is my answers to your 2:
You can allow this specific user/mailbox this way:
- Go to https://security.microsoft.com/antispam
- Select "+ Create policy" and choose "Outbound"
- Give your new outbound spam filter policy a name and description.
- Click Next and search to find the user account you want to allow to forward
- Click Next again, scroll down to the Forwarding rules section, and click the dropdown under Automatic forwarding rules. Choose On - Forwarding is enabled, then click Next.
It is possibel to allow it for all in the Anti-spam outbound policy (Default) policy, but I will NOT recommend that.
Hope this help you :)