Email notification preference?

Here is the scenario our customer wants to implement:

• When service ticket is saved, send an email notification to customer (with workflow rules)
• If customer has opted out of email notifications, email should not be sent.

Does anybody know whether the scenario above is covered with customer Marketing permissions?

I have got a feeling marketing permissions will work for marketing outbound email campaigns but not necessarily for workflow rules with email notification like the scenario above.

Can anybody confirm please?

Cheers