I set a forward from my work mailbox to my Gmail. Nothing arrives and I got a message about an external recipient being blocked. How can I fix it?

Microsoft turned off automatic forwarding to outside addresses by default. The outbound spam policy decides this, and only an admin can change it.

In the Microsoft Defender portal go to Email & collaboration > Policies & rules > Threat policies > Anti-spam policies. Open the Outbound policy, find Automatic forwarding rules, and set it to On for the users who need it. Save.

It is a security setting, because forwarding is a common way to steal mail after an account is hacked. Ask yourself if forwarding is really needed. A safer way is to add the mailbox to Outlook on your phone instead. If it must stay, limit the policy to the one user.

Admin changed the policy for my account only. Forwarding works. Thanks.