Achievement of a milestone — a birthday or anniversary, birth of a new child. Getting a new job, buying a home, winning an award, getting married, an anniversary — is an ideal reason to send someone a letter of congratulations. The reader will be pleased that you remembered the event and took the time to acknowledge it in writing.
Tips for Writing Congratulations Letters
• Congratulate the reader for her achievement, accomplishment, anniversary,new child, or whatever.
• Tell her where you learned about the accomplishment.
• Add a comment of a personal nature (e.g., if the reader is a former teacher,tell him how much being in his class meant to you).