I am writing to convey my warm congratulations on your appointment to the Board of Asia Industries Ltd.
My colleagues and I are delighted that the years of service your have given to your company should at last have been rewarded in this way and we join in sending you our very best wishes for the future.
書信的格式：
1. 信頭：指發信人的地址和日期，寫在信紙的右上角。
2. 稱呼：指對收信人的地址和稱呼。寫在信頭之下，從信紙的左邊開始。寫信給熟悉的人，如王明一般用Dear Wang Ming 或Dear Mr. Wang。
3. 信的正文：指信的主體部分，從稱呼的下一行到結束語前，第一段頂頭寫。
4. 結束語：指正文下面的結束客套話。常用Yours sincerely, Yours ever, 或者Yours 或Yours truly,Truly Yours等。
5. 簽名：指發信人的簽名，寫在結束語的下面。
拓展資料：書信範文：
Dear Mr. Smith,
I am writing to convey my warm congratulations on your appointment to the Board of Asia Industries Ltd.
My colleagues and I are delighted that the years of service your have given to your company should at last have been rewarded in this way and we join in sending you our very best wishes for the future.
Yours sincerely