Good day [recipient],
This is to let you know that we will be implementing changes regarding our free-shipping policy.
Due to the recent hike in fuel, we’ll be limiting the free-shipping feature to orders that cost [amount] and up. We are also saddened by this development but our company can no longer afford to shoulder the cost of delivery by ourselves.
We hope you understand the necessity of having this rule in place and we hope this doesn’t diminish our good relations with you.
[Name of sender]