I am____（具体名字题目给出）. I am writing to you to express sincere congratulations on your success and happiness!
As a matter of fact, I know that you have devoted a great deal of precious time as well as energy to it. During the past valuable time and experience, you have obtained not only rich work experience but also wide-spreading interpersonal relationship. Therefore, the past experience has laid solid foundation for the present success. I wish you to accept my heartfelt(发自内心的) congratulations. In fact, I have also learned a lot from your achievement this time. You have set up a brilliant example for us to make success and realize our dreams in the near future.
Congratulate to you again with my faithful blessings! I am quite sure that you will make much greater accomplishment with your effort and devotion!