There has been a recent change in Microsoft's security policy that restricts auto-forwarding emails to external domains. If you receive a bounce-back email when auto-forwarding emails to your HappyFox account's email address (Eg. accountname-1234@happyfox.com), please follow the below steps.

To work around this and modify existing security policies or to create a new outgoing policy and allow auto-forwarding to HappyFox, please follow the below steps. 

To create, edit and delete outbound policies, you need to be a member of one of the following role groups:

• Organization Management or Security Administrator in the Security & Compliance Center.
• Organization Management or Hygiene Management in Exchange Online.

Note: This applies only for accounts that have an existing forwarding rule setup to auto-forward emails to your HappyFox. If you are looking to setup a new forwarding rule, please review this article.

1. Log on to https://security.microsoft.com/antispam with your credentials directly or head over to Security & Compliance Center > Threat management > Policy > Anti-spam if already logged in.

2. Click Create policy > Outbound or choose from the list if you wish to modify an existing policy.

3. Once the Outbound spam filter policy section appears, configure the following settings:

• Name: A unique name for the policy (for new policy only)

• Description: An optional description for the policy (for new policy only)

Click Next.

4. Provide the User, Groups and Domain information as required.

Click Next.

5. In Protection Settings make sure to choose On - Forwarding is enabled Automatic forwarding rules

6. Click Next, to review the settings and Save.

7. When you're finished, click Create.

Now you should be able to use the Forwarding option with your Microsoft 365 mailboxes however if it still shouldn't work then there still might be other transport rules or spam policies in place at Microsoft 365 that block external forwarding. If automatic external forwarding is still blocked after adjusting the policies covered about, you should contact Microsoft 365 support for assistance in finding any further blocking that has been set up in your Microsoft 365 account.