OOB 'Collaboration Offline Group Message(s)' email notifications can't be send to offline chat participants.
Steps to Reproduce
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
4. agentB accepts the request
5. agentB logs out
6. userA sends messages
7. Wait for collaboration.email_interval (OOB, 3 mins)
No email is being sent
An email is sent to offline users.
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Related Problem: PRB1341119