Instead of having a text box,What about having a select text box for pin code, if specific pin codes are only allowed to enter.
Also I would be nice to have a dynamic delivery date which changes according to the pincodes.
Yes, there should be an option to do it.
Sorry for the inconvenience caused.Thank you for your valuable feedback.Currently we have kept both of these Feature Requests on hold.However we value your gesture and will notify you whenever this Feature Request will be taken into consideration.
However we are working on a feature where the customer can see the pin codes where the deliveries are possible or restricted, on the product page itself.