If the courier company is unable to deliver the order and the shipping status is undelivered or RTO (Return to Origin) due to any reason, it will be returned to our default address QikInk.com 42A, Ambrose Nagar, Somanur Road, Karumathampatti, Coimbatore, Tamil Nadu - 641659 and will be added to your returns management system in the dashboard.
We will email you once the order is returned and is dded to your Dashboard > Returns Management System

Using a custom return address for return is not possible since the courier companies do not have such an option.
Here are a few reasons why your orders can be undelivered or RTO’ed :
Pincode not serviceable
COD amount not ready
Customer not contactable
Incomplete address
Customer refused delivery
Self-pickup requested by the customer
Future delivery requested by the customer
Door/premises/office closed