Do you mean that:
- Only block emails with attachments sent to groups.
- Could send emails with attachments to individual mailbox/group members.
If so, you cannot achieve it so far, because SentTo predicate does not allow distribution groups:
Here may be a workaround for you:
- Add a mail tip to this group (It may take a while for it to take effect):
- Add a mailbox to moderate emails sent to this group.
If you want to block the emails with attachments to group and individual mailbox, you could use the "The recipient is a member of"
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