Check who should receive the message
Confirm that you have the right person, the right role, and permission to disclose the information involved. For a message about how to decline repeated work favors from a friend, use this factual base: name the recurring contact, request, topic, or behavior and the effect it has on you.
Separate information from interpretation
Label confirmed facts, open questions, and the specific decision that belongs to the recipient. State the limit, any acceptable alternative, and what you will do if the pattern continues. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Use formal help when stakes rise
Do not diagnose your friend, list every past grievance, or threaten public embarrassment. For stalking, threats, coercion, or self-harm concerns, preserve evidence and use appropriate crisis or safety support. Medical, legal, financial, employment, and safety decisions may require a qualified professional rather than personal persuasion.