1. 表达感激之情：在邮件中，表达对客户长期以来的支持与信任的感激之情。提及合作中的亮点和成功，强调他们在共同努力中所起的关键作用。这不仅是一种对客户的尊重，也是对双方共同努力的认可。

2. 总结合作成果：回顾过去一年的合作，总结取得的成果和里程碑。这有助于客户更清晰地了解你们的合作对双方的影响，同时也是对合作关系的一种强化。客户在这封邮件中可以看到，他们的选择是明智的，他们的业务伙伴是值得信赖的。

3. 展望未来合作：在邮件的结尾，展望未来的合作。表达对新一年的期望和愿景，强调你们将如何继续努力提供优质的产品或服务。让客户感受到你们对合作的承诺，激发他们对未来的信心。

Subject: Expressing Gratitude and Looking Forward to Future Collaboration

Dear [Client's Name],

As the year comes to a close, I want to take this opportunity to express our heartfelt gratitude for your continuous support and trust throughout the year. In our collaboration, we have experienced numerous successes and achievements, and your unwavering support has been instrumental in our journey.

Reflecting on the past year, we have collectively celebrated significant milestones. Your business has made remarkable progress, and we take pride in being a part of and supporting this journey. Your choice is our greatest motivation, and we are committed to continuing to provide even higher-quality products and services.

As we step into the new year, we eagerly anticipate continuing our partnership and striving for greater success together. May the coming year bring you and your business prosperity and success.

Sincere thanks for your ongoing trust and support.

Best wishes,

[Your Name] [Your Company]

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