A Spontaneous Good Customer Relations Letter is a letter written to a customer to show appreciation or gratitude for their loyalty and patronage. This type of letter is often sent on its own initiative and is not in response to a specific request or complaint. It is an act of goodwill that can help strengthen the relationship between the customer and the business. There are different types of Spontaneous Good Customer Relations Letters. A "Thank You" letter is written to show appreciation for a customer's loyalty and patronage. A "Welcome" letter is used to welcome a customer to the business and introduce them to its services or products. A "Congratulations" letter is written to recognize a customer's achievement or success. An "Invitation" letter is used to invite customers to special events or promotions. Finally, an "Appreciation" letter is written to express gratitude for a customer's support and loyalty.