Sending an email after someone buys something is a good way to build trust and show appreciation. It makes the customer feel noticed, not just like another sale. A simple thank-you email or one that shares helpful tips on using the product can make a big difference. It also gives a chance to ask for feedback or offer support if they have any issues. Some businesses use this moment to suggest related items, but it's important not to sound pushy. Keeping the message friendly and helpful usually works better. What kind of post-purchase emails do you think help maintain customer relationships most effectively?