Enable External Forwarding in Microsoft 365

When setting up forwarding from Microsoft 365 (formerly referred to as Office 365) to Help Scout, you may need take an additional step to complete the process. Some Microsoft 365 accounts default to block automatic email forwarding as part of their outbound spam protection. If external forwarding is disabled for your Microsoft 365 account, you will see a specific bounce message in your inbox at Microsoft 365 after attempting to set up forwarding to Help Scout. The text of the bounce will include this line: 

550 5.7.520 Access denied, Your organization does not allow external forwarding. Please contact your administrator for further assistance. AS(7555)

To change the outbound spam protections settings, contact your Microsoft 365 administrator and ask them to allow automatic external forwarding for any mailboxes you want to use with Help Scout. We’ve created this guide to help your administrators find and change the outbound spam protection policy that is blocking your forward.

For Administrators

Microsoft's documentation on this setting is found here: Configuring external email forwarding in Microsoft 365

You may choose to enable automatic forwarding for all mailboxes in your Microsoft 365 account, or enable it only for the mailboxes you're forwarding to Help Scout. Choose the option that is best according to your organization's security policies. 

Note: The menus and options you see in your Microsoft 365 account may vary depending on several factors, including the level of service you have with Microsoft or if you purchased Microsoft 365 through a reseller. Reach out to your reseller or Microsoft support if you are unable to follow the directions here. 

In this article

Enable Automatic External Forwarding for All Mailboxes

1
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

2
Click the down arrow next to Outbound spam filter policy ‎(always ON) and click the Edit policy button.

3
Click the down arrow next to Automatic forwarding, then choose On - Forwarding is enabled from the dropdown. Click Save

Enable Automatic External Forwarding for Individual Mailboxes

1
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.

2
Click + Create an outbound policy.

3
Give your new outbound spam filter policy a Name and Description. Click the down arrow next to Automatic forwarding to expand that section. Choose On - Forwarding is enabled from the dropdown.

4
Click the down arrow next to Applied to, then +Add a condition. Choose Sender is from the dropdown list, then click in Add a tag to find the email account(s) you'd like to allow to automatically forward and select them. 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. 

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