How to Write Professional Emails with AI and Voice in Minutes

You need to send an email to a client. You know what you want to say — roughly. But between opening the inbox, choosing the right words, finding the appropriate tone, and checking the punctuation, 15 minutes have passed. And the next email is right around the corner.

The problem isn’t a lack of content. It’s that writing professional email is a constant exercise in translation: you think one way and need to write another. The idea flows in your head, but stalls on the screen.

There’s a more direct path: speak the email as if you were explaining it to a colleague and let AI transform it into structured text — with subject line, greeting, body, and closing — in Portuguese, in the right tone, ready to send.

Why writing email takes so much time

A professional spends an average of 2 to 3 hours per day dealing with email. It’s not just the volume — it’s the cognitive cost of each message:

• Right tone: too formal sounds cold. Too informal sounds unprofessional. Finding the middle ground takes trial and error.
• Structure: subject, opening, context, request, closing. Everything in the right order.
• Rewriting: you write, read, don’t like it, delete, start over. The first draft rarely works.
• Correct grammar: agreement, punctuation, accents — details that weigh heavily on your professional impression.

The result is that an email that could take 2 minutes of conversation becomes 15 minutes of typing. Multiply that by 10, 20 emails a day and the time disappears.

What changes when you speak instead of type

Speech is naturally faster than typing. You speak at 130–150 words per minute. You type at 35–40. But the advantage isn’t just speed — it’s flow.

When you speak, your brain doesn’t have to split attention between thinking and typing. The idea comes out whole, without the pauses that the keyboard imposes. The historical problem with dictation was transcription: the text came out raw, without punctuation, without structure, full of “umms” and “like.” You spent as much time correcting as you would have spent typing.

AI changed that. Today, you speak naturally and AI delivers:

• Accurate transcription in Brazilian Portuguese
• Automatic punctuation and paragraphs
• Email structure (subject + body + closing)
• Adjustable tone (formal, business, friendly)

How to write professional email with Sintesy — step by step

1. Open Sintesy and start recording

On the app or the web, click record. Speak as if you were explaining the matter to a trusted colleague. No formality, no worrying about punctuation, no going back to correct.

Example of what you’d say:

“Hi, I need to send an email to Ana at company X. I want to thank her for yesterday’s meeting, confirm that we’ll send the proposal by Friday, and ask whether she prefers to receive it by email or wants a call to present it.”

Notice: you’re not writing an email. You’re describing what you want to communicate. AI handles the rest.

2. Sintesy transcribes and organizes

Within seconds of stopping the recording, you receive the complete transcription. Sintesy understands Brazilian Portuguese with high accuracy — including regional accents, proper names, and business terms.

The transcription already comes with punctuation and paragraphs. But what makes the difference is that the text captured exactly your intention — because you were the one who spoke it.

3. Use the transcription as the basis for the email

Now you have the raw content. The next step is to turn it into a professional email. You can do this in two ways:

Quick manual: copy the transcription, paste it into your email, adjust the greeting and closing. Takes 1–2 minutes.

With AI: ask AI to rewrite the transcription in professional email format. Sintesy can structure the text with subject, greeting, body, and closing — in the tone you set.

4. Adjust the tone and review

The generated email will be 90% ready. You review, adjust details (a name, a deadline, a word) and send.

Total time: 2 to 3 minutes. Including the recording.

Practical example: before and after

What you say (40-second audio):

“I need to reply to Carlos about the proposal. Say that we analyzed it, that the delivery timeline will be 15 business days from confirmation, that the value is what was quoted in the meeting, and that everything’s set to close. I want a subject like ‘Proposal confirmation — Carlos partnership.’”

What AI delivers:

Subject: Proposal Confirmation — Carlos Partnership

Hi Carlos,

Thanks for getting back to me. We’ve reviewed the points discussed in the meeting and can confirm the proposal details:

• Delivery timeline: 15 business days from confirmation
• Value: as quoted in the meeting
• Terms: all aligned as discussed

We’re ready to move forward. Let me know if any adjustments are needed — I’m available.

Best, [Your name]

What took 40 seconds of speaking became a professional email in under 2 minutes. No notepad, no rewriting, no anxiety about tone.

Tips for dictations that produce better emails

State the context first. Before the email content, say who it’s for, what the general topic is, and what tone to use. Example: “Formal email to the CFO about the expense report.”

Mentally structure in points. If the email has several items, state each point separately: “First point: confirm the meeting. Second point: request the spreadsheet. Third point: suggest a new date.”

Don’t worry about pretty words. Speak simply. AI handles the formality. What matters is that the information is there.

Repeat if you stumble. If you trip over a sentence, just say it correctly right after. During review, you pick the right version.

When to use voice and when to type

Voice works best for:

• Follow-up emails after meetings
• Replies to clients with multiple points
• Proposal or confirmation emails
• Messages where tone matters (thank-you, apology, negotiation)

Typing still makes sense for:

• One-line emails (“confirmed, thanks”)
• Quick replies in chat conversations
• Technical messages with code or exact numbers

The rule is simple: if the email is more than 3 lines, dictating is faster.

How much time you save

Consider a conservative scenario: you write 10 professional emails per day. Each takes 12 minutes between thinking, typing, reviewing, and rewriting.

• Typing: 10 × 12 min = 2 hours per day
• With voice + AI: 10 × 3 min = 30 minutes per day
• Savings: 1h30 per day, 7h30 per week, 30 hours per month

That’s nearly a full workday per month that comes back to you.

Start now

If you already have Sintesy, the workflow is ready. Open the app, click record, speak your next email, and watch the transcription come out in seconds. Copy it to your email client, adjust the tone, and send.

If you’re not using it yet, give it a try. The first email you dictate will convince you — because it’ll be the fastest one you’ve ever sent.