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@devnull I think to prevent delivery to a shared inbox that's also the shared inbox of someone on bto or bcc, I'd need this:

```
// get shared inboxes of private recipients
const excluded = await getSharedInboxes(privateRecipients)

// get shared inboxes unless the same as private recipients, otherwise get direct

const publicInboxes = await getSharedOrDirectInboxes(publicRecipients, { exclude: excluded })
```

HTH.