By default, if a User CCs an Agent into a Ticket email, the Agent will not be added as a follower of the Ticket.
You may want Users to be able to add Agents as followers; bear in mind that adding an Agent as a follower means they can always see a Ticket, overriding Agent and Department permissions.
You can enable this feature from Channels > Email > Settings:

Warning
Think carefully before enabling this option. It means that Users can enable Agents to see Tickets that they wouldn’t be able to see based on your Permission settings.
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