A bit improvement on expensive and unreliable helpdesk offerings in the past.

Pros:
- generous limits when max stacked
- excellent email deliverability

Cons:
- no way for customer to know the ticket (reference) number of a support request without the agent manually adding it to the ticket. This could be easily fixed by DoneDone by simply adding the reference number as an available variable within Signatures. The reference number already exists as a variable within auto-responders, so I would think it is a simple change to add it in.