How to Write Emails with OpenAI on Mac
Draft polished, professional emails in seconds using OpenAI and Echoo. Select rough notes or bullet points, hit a shortcut, and get a ready-to-send email — works in Gmail, Outlook, Apple Mail, or any app.
Why This Combination Works
OpenAI's GPT-4o produces natural, fluent prose that reads like it was written by a skilled communicator. It adapts effortlessly to different email contexts — from formal business proposals to friendly team updates. The model's speed means your email drafts arrive almost instantly, keeping you in flow.
Recommended Model
GPT-4o — its natural language fluency and fast response time make it the best choice for producing polished emails that sound authentically human.
Example Prompt
Rewrite this rough draft as a professional email. Keep the tone warm but businesslike. Include a clear subject line suggestion. The email should be concise — no more than 3 short paragraphs.
Setup Steps
Download Echoo
Install Echoo from echoo.ai and launch it from your menu bar. The app runs quietly in the background, ready whenever you need it.
Add your OpenAI API key
Open Echoo settings, navigate to Providers, and paste your OpenAI API key. Select GPT-4o for the best email writing quality.
Create an Email Writing command
Set up a custom command with a system prompt like "You are an expert email writer. Transform the user's rough notes into a polished, professional email. Suggest a subject line. Keep it concise."
Write emails with a shortcut
Type rough notes or bullet points in any app, select the text, press your shortcut, and Echoo replaces your notes with a polished email draft.
Frequently Asked Questions
Yes. Echoo works system-wide on macOS. Select your draft text in Gmail, Outlook, Apple Mail, or any other app, trigger the shortcut, and the polished email replaces your selection.
GPT-4o produces very natural-sounding prose. The key is providing good context in your rough notes — the more detail you give, the more natural and personalized the output. You can also customize the tone in your command prompt.
Each email draft costs a fraction of a cent with GPT-4o. Even writing 50 emails per day would cost well under $1/month. Email drafts are short, so token costs stay minimal.
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Ready to Try It?
Download Echoo for free and start transforming text with AI shortcuts.