Forwarding in outlook requires an extra permission to be set in outlook. This will make sure your mails will actually be forwarded from outlook in to Trengo.
- Log in to your Office 365 Security & Compliance portal for Microsoft 365 and choose Threat management > Anti-spam or head directly to the Anti-spam settings page here: https://protection.office.com/antispam
- Click the down arrow next to Outbound spam filter policy (always ON) and click the Edit policy button.
- Click the down arrow next to Automatic forwarding, then choose On - Forwarding is enabled from the dropdown. Click Save.
💡 Note: You may have other transport rules or spam policies in place at Microsoft 365 that block external forwarding in addition to the outbound spam filtering we've covered here. If automatic external forwarding is still blocked after adjusting these policies, you will want to reach out to your Microsoft 365 support for assistance in finding any further blocking that has been set up in your Microsoft 365 account.