Symptoms

When you create a transport rule (mail flow rule) and select the SentToMemberOf (is member of this group condition) parameter, it should show only the distribution groups, dynamic distribution groups, or mail-enabled security groups. However, the list shows everything including normal mailboxes, contacts, linked mailboxes, and every recipient type.

Cause

The filter that’s used in this scenario isn't correct.

Resolution

To fix this issue, install one of the following updates:

References

Learn about the  terminology that Microsoft uses to describe software updates.

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