OOB 'Collaboration Offline Group Message(s)' email notifications can't be send to offline chat participants.

1. userA logs in from browserA
2. agentB logs in from browserB
3. userA starts a chat request against a chat queue from virtual agent or from chat queue
i.e. <instancename>/$chat_support.do?queueID=<sysid>
4. agentB accepts the request
5. agentB logs out
6. userA sends messages
7. Wait for collaboration.email_interval (OOB, 3 mins)

Actual behavior:
No email is being sent
Expected behavior:
An email is sent to offline users.

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