First, take a breath! Resist the temptation to respond immediately. Take the time to consider whether you need to respond at all, and if you do, consider trying a BIFF Response. This approach, developed by the High Conflict Institute, recommends being brief, informative, friendly, and firm. Keep it short and resist getting personal. Stick to the facts. Show empathy in your comments, avoid sarcasm and threats, and use a friendly or professional greeting and closing. Be firm in a matter-of-fact way and try not to invite further discussion—state your concern or information, close your message, and stop.