"550 5.6.0 APPROVAL.InvalidExpiry" when sending messages to a moderated recipient

• Applies to:

  Exchange Online Protection

Symptoms

You have configured message moderation for a distribution group or a dynamic distribution group so that each message that's sent to the group must be approved by a moderator.

When an email message is sent to the group, the sender receives a non-deliver report that includes following error message:

OrgExtensionProperties0_LONG_GUID@contoso.onmicrosoft.com
Remote Server returned '550 5.6.0 APPROVAL.InvalidExpiry; Cannot read expiry policy. [Stage: OnCreatedEvent][Agent: Approval Processing Agent]"

Cause

The message approval agent requires that the retention policy has a retention policy tag with the IsDefaultModeratedRecipientsPolicyTag property is set on it.

Resolution

For moderated distribution groups in your Exchange organization, you must create a retention policy tag that has the IsDefaultModeratedRecipientsPolicyTag property set.

To set the retention policy tag, do the following:

1. From a PowerShell prompt, open Exchange Online PowerShell. For more information, see Connect to Exchange Online PowerShell.

2. Run the following cmdlets:

   Enable-OrganizationCustomization
   New-RetentionPolicyTag -IsDefaultModeratedRecipientsPolicyTag -Name TagforModeration -AgeLimitForRetention 2
   

This creates Personal retention tag on the retention policy. For more information on retention tag types, see Retention tags and retention policies in Exchange Server.