How Do You Use Claude to Turn a Blog Post Into an Email Your List Actually Reads?

You use Claude to turn a blog post into an email by giving it a specific job: shrink, don't summarize, and lead with the one thing the reader needs, not the order you originally wrote it in. Copy-pasting the post itself almost never works, and I want to tell you why before I give you the structure that does.

I'm Etta, I write and repurpose newsletter content for PITL, so this is a task I run constantly.

Why Copy-Pasting a Blog Post Into an Email Falls Flat

A blog post reader clicked because they were already curious. They're sitting with a cup of coffee, or they've got ten open tabs and picked yours on purpose. They'll scroll. They'll skim headers. They'll forgive a slow start.

An inbox reader is a completely different animal. They didn't click anything yet, your email is competing with forty other unread messages for about two seconds of attention before they decide to open, skip, or delete. If the first thing they see is three paragraphs of blog-post throat-clearing before you get to the point, you've already lost them. They never even opened it.

That's the whole problem with copy-paste. A blog post is built to be browsed. An email has to win the open, then win the first sentence, then earn every line after that. Different job, different shape.

The Prompt Structure That Actually Works

This is one of the few spots where I'll tell you exactly what to type, because this is a specific technique, not a one-off trick you need to go hunting for again next time. Once you've got this structure, you reuse it on every post.

Paste the full blog post into Claude, then give it something close to this:

"Here's a blog post I wrote. Turn it into an email newsletter. Requirements: open with the single most useful or surprising idea from the post, not the original intro. Keep it under 200 words. Write in short paragraphs, one to two sentences each, so it's easy to scan on a phone. End with one clear next step, a link back to the full post or a specific action to take. Match this voice: [paste your voice notes or a past newsletter here]. Do not just summarize every section, pick the one thread that matters most and follow it."

A few things doing real work in that prompt. Telling it to skip the original intro matters, because blog intros are built for search engines and browsing readers, not inbox attention. Capping the word count forces it to choose, not compress everything a little. And asking for one clear next step keeps the email from turning into a table of contents nobody acts on.

Run it. Read the output. Cut anything that still sounds like a summary instead of a point. You're not looking for a shorter blog post, you're looking for a different piece of writing that happens to share source material.

Why the Subject Line and First Sentence Carry the Whole Email

Here's the part people skip, and it's the part that matters most. Your subject line decides whether the email gets opened. Your first sentence decides whether it gets read past that. Everything else you wrote, the careful structure, the one good idea, none of it matters if those two things don't do their job first.

Once you've got your shrunk email draft, run a second, smaller pass with Claude focused only on those two pieces. Ask for five subject line options built from the strongest idea in the email, not the topic in general terms. "5 tips for X" is a topic. "The one automation that actually saved me time" is a hook. Ask Claude to explain in one line why each option might work, so you're not just picking blind, you're picking with a reason.

Do the same for the first sentence. It should either state the payoff directly or open with a specific, concrete detail, never a warm-up line like "I hope this finds you well" or "Today I want to talk about." Your list already agreed to hear from you. Don't spend their patience on a windup. Get to the thing.