写一封英文邮件，首先很高兴贵方对样品十分满意。发PI和协议，请求查阅附件并确认内容。附上了贵方所需产品的CE证书。期待后续联系

Subject: Follow-up on Sample and Request for Confirmation Dear [Recipient's Name], I hope this email finds you well. I am writing to follow up on the sample that we sent to you and to express our gratitude for your satisfaction with it. We are thrilled to hear that it met your expectations and we are excited to move forward with our business relationship. As per our discussion, I am attaching the Proforma Invoice (PI) and agreement for your review. Kindly go through the documents and let us know if you have any questions or concerns. We would be happy to clarify any doubts that you may have. Additionally, I have attached the CE certificate for the product that you have requested. We understand the importance of compliance and we assure you that all our products meet the necessary standards. We look forward to hearing back from you soon and hope to continue our collaboration. Thank you for your time and consideration. Best regards, [Your Name]