I guess yes, all the active subscribers when the router receives the message.
If the message is not successfully acked by all of them, then yes the message 
is requeued and sent again to all active subscribers.
If one of the subscribers disconnects in the middle of the process I would say 
we are back to the previous case and the message is resent to all active 
subscribers.
We don't really mind receiving the message twice in some corner cases.

Olivier

-----Original Message-----
From: Gordon Sim <[email protected]>
Sent: lundi 12 novembre 2018 21:46
To: [email protected]
Subject: Re: [Dispatch Router] multicast distribution

On 12/11/18 19:32, VERMEULEN Olivier wrote:
> when all receivers acknowledge it

How is the set of 'all' receivers defined? All those active at the time the 
message is received by the first router? (What if one of them had been 
disconnected just before that message?)

If a message is not successfully acked, would it be requeued and replayed to 
all subscribers?

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