Training AI to Write Email in Your Voice

Most AI-drafted emails have a certain sameness to them: the same careful hedging, the same formal opener, the same tone whether you're writing to a client or your electrician. People notice. That sameness is fixable, and it comes down to two things most people never tell the AI: what they actually sound like, and who they're writing to.

Give it your voice first

Paste three to five emails you've actually sent, ideally ones you were happy with, into your AI tool and ask it to describe your voice: sentence length, formality, how you open and close, phrases you use, things you never say. Save that description somewhere you can reuse it, a saved prompt, a Claude Project, a custom GPT, or just a text file you paste in at the start of a session.

Once the AI has that reference, it stops defaulting to generic AI voice and starts sounding like you. Test it before you trust it: ask it to draft something routine, then read the result out loud. If it doesn't sound like something you'd actually say, tell it what's off and try again. Ten minutes of setup, and every email after gets easier.

Then tell it who it's talking to

Voice is half the job. The reader is the other half, and it's the part most people forget to mention at all.

A note to a client should read differently than the same information sent to a vendor, and both should read differently depending on how much the other person already knows about the subject. A few concrete cases:

• A client: warm, reassuring, plain language. Confirm what's happening next and when. Skip technical detail unless they asked for it.
• A vendor or contractor: shorter, transactional, straight to the dates and numbers. They want the ask, not relationship-building.
• Someone who knows the subject cold: drop the background explanation, lead with the decision or the number, let them ask if they want more.
• Someone new to the topic: define terms as you go, explain the why and not just the what, and keep the tone patient.

Say this to the AI in plain language before it drafts anything: "this is going to a vendor who just needs the delivery date confirmed," or "this is for a client who's anxious about the timeline, keep it reassuring." One sentence of context changes the entire draft.

Put it together

A prompt that actually works combines both pieces: your voice, plus who's reading. Something like:

Draft a reply to Sam at Northline Supply. They're a vendor, not a client, so keep it short and transactional; they just need confirmation of the delivery date. Write it in my voice: direct, a little informal, no corporate throat-clearing.

That's the whole method. How you sound, and who you're talking to, stated plainly, every time.

Why it's worth the ten minutes

None of this is complicated, which is exactly why most people skip it and end up editing every AI draft from scratch anyway. Teaching the AI your voice once and your audience each time turns it from a first draft you have to rewrite into one you can actually send.