Write Better Emails in Half the Time with Claude

Most AI-written email has a tell. The weird openers ('I hope this email finds you well'), the parallel sentence structure, the over-correction toward 'professional' that ends up sounding like a 90s corporate memo. Recipients can spot it. It signals 'this person didn't think hard about me.'

Done well, AI-drafted email saves real time without losing the voice that makes recipients actually want to reply. Done poorly, it costs you trust. The difference is in the prompts.

Here are the prompts that have replaced ~70% of my drafting time, by email type.

The 'voice match' prompt, the foundation of every other prompt

Before you write a single AI-drafted email, you need to teach the model your voice. This is a one-time prompt. Save the output. Reference it forever.

Below are 5 emails I've written in my actual voice. Read them carefully and extract:

1. The 5-7 specific characteristics of my writing voice (vocabulary, sentence length, openers/closers I tend to use, formality level, use of humor or directness, etc.)
2. The 5 phrases or words I use repeatedly that signal "this is mine"
3. What I never do (e.g., never use exclamation marks, never say "Hope this finds you well")
4. A 2-sentence voice summary I can paste into future prompts

Email 1:
[PASTE]

Email 2:
[PASTE]

Email 3:
[PASTE]

Email 4:
[PASTE]

Email 5:
[PASTE]

Output of this prompt → save in your notes. The '2-sentence voice summary' becomes the secret ingredient in every other prompt below.

Prompt 1: Cold outreach

[VOICE SUMMARY HERE]

I'm reaching out to [PROSPECT NAME], who is [ROLE] at [COMPANY]. I want to:
- Introduce myself briefly
- Reference something specific about them (their work, a post they wrote, a mutual connection)
- Make a clear, low-friction ask

Context I have:
- [Specific thing about them]
- [The ask, book a 15-min call, reply with a yes/no, etc.]
- [Why now, what triggered this outreach]

Constraints:
- Under 120 words
- One specific compliment, not generic
- The ask is one clear action
- No "I just wanted to" or "I hope you don't mind"
- No fake "I've been following your work for years"
- Use my voice (from the summary above)

What makes this work: the model needs the specific reference to fill in a real human-sounding hook. Generic cold prompts produce generic cold emails.

Prompt 2: Follow-up

[VOICE SUMMARY HERE]

I emailed [NAME] [X days/weeks] ago about [TOPIC]. No response. I want to send a brief, non-pushy follow-up.

Original email I sent:
[PASTE ORIGINAL]

Draft a follow-up that:
- Acknowledges the original without re-summarizing it
- Adds one small piece of new value or context (a relevant article, a new thought, a softer ask)
- Makes it easy to say yes OR no, no guilt
- Under 80 words

Avoid: "Just bumping this up," "Did you see my last email?", "Following up on the below."

The hardest part of follow-ups is sounding interested without sounding desperate. The 'new value' clause does most of the heavy lifting here.

Prompt 3: Declining politely

[VOICE SUMMARY HERE]

[NAME] asked me [WHAT THEY ASKED]. I want to decline, but warmly. Reason I'm declining:
[REASON, be honest with the model even if you'll soften it]

Draft a 4-6 sentence reply that:
- Thanks them for the ask
- Declines clearly (no "let me think about it" wishy-washy)
- Gives a reason if appropriate, or doesn't if it's not their business
- Offers an alternative if there is one (or doesn't if there isn't)
- Doesn't apologize more than once

Avoid: "Unfortunately," "Sadly," and any phrasing that hints I might reconsider if they push back.

The 'doesn't apologize more than once' rule is the key. Most decline drafts apologize 3-4 times and end up sounding insecure. One apology, one decline, done.

Prompt 4: The 'ask' email

[VOICE SUMMARY HERE]

I'm writing to [NAME] to ask them [SPECIFIC ASK]. We have [RELATIONSHIP, colleague, vendor, friend].

Constraints:
- Lead with the ask in the first or second sentence (not buried)
- Explain why I'm asking them specifically (not generic flattery)
- Give them an easy out, they can say no without it being weird
- Specify exactly what a "yes" looks like (deadline, what I need, etc.)
- Under 120 words

Voice: clear, direct, warm. Not over-grateful before they've agreed.

Prompt 5: Thank-you / appreciation

[VOICE SUMMARY HERE]

I want to thank [NAME] for [WHAT THEY DID]. The impact on me was [SPECIFIC IMPACT, not generic "really helpful"].

Constraints:
- One specific thing they did and one specific outcome
- No "I just wanted to take a moment to thank you" preamble
- Under 60 words
- End with one sentence that's NOT a future ask. Just thanks.

This is a relationship deposit. No transactional follow-up.

Editing techniques to strip the AI-tells

Even with a great prompt and good voice match, AI drafts have telltale residue. The last 5 minutes of editing is where you make it sound like a human wrote it. Three techniques:

1. The 'parallel structure' purge

AI loves rhythm. Every paragraph the same length. Every sentence the same shape. Real writing has irregular cadence. Break the rhythm, make one sentence very short. Make the next a long one. Mix it up.

2. The 'AI vocabulary' purge

Words and phrases to delete on sight:

• 'Leverage' (use, do, build, with)
• 'Streamline' (simplify, speed up)
• 'Robust' (just delete)
• 'It's worth noting that' (delete; if it's worth noting, just note it)
• 'In today's fast-paced world' (delete)
• 'Whether you're a [X] or [Y]' (delete; pick one)
• Em dashes used to add fake nuance (sometimes appropriate, often not, kill the ones that aren't load-bearing)

3. The 'voice gut check'

Read the draft out loud. If you wouldn't actually say it that way in a voice memo, change it. AI writes like a memo. Humans write like they talk (when they're writing well).

When NOT to use AI for email

• Anything emotionally serious, bereavement, breakups, real apologies. The recipient deserves the moment of friction you'd feel writing it yourself.
• Negotiation, AI optimizes for 'helpful,' not for 'protecting your interests.' Write these yourself or with a human collaborator.
• Anything you'd be embarrassed to send, if you'd be embarrassed by the AI version, the AI version isn't ready. Don't outsource your reputation to a draft you didn't read closely.
• First emails to people you really want to impress, these are too important to phone in. The 90 minutes you save by drafting with AI cost you the relationship if the recipient can tell.