Gregory's ServerBasically, if `userA@domain1` has followers `userB@domain2`, `userC@domain2`, and `userD@domain2`, and they have an activity that has `to`: `followers` and `bcc`: `userD@domain2`, and domain2 has a shared inbox, you can't deliver to the shared inbox without double-delivery to userD. domain2 can do double-delivery-detection, but that kind of sucks.
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3 comments
  @evan according to activitypub spec, if one sends to a shared inbox, they mustn't also send to specific inboxes (or at least, that's how we understood it?) There's also something about making sure the system works with BTO and BCC. |
@evan you can't? I thought that was explicitly how shared inboxes worked.
In your example my understanding is domain2 would receive a single activity, and parcel out the activity to the other users internally as appropriate. How that's actually handled by domain2 is out of scope of the spec.
A potential complication could arise if you're saving a serialzied representation of that object for validation, in which case it wouldn't pass as you have to remove bcc from the object...