What's included:

In 2026, your email is not only being read by people. It is also being interpreted by inbox tools before the person even opens it.

Your Email Now Has Two Readers

Something quietly changed in how email works — and most marketers haven't adjusted yet.

When someone receives your email today, there's a good chance an AI reads it first. Gmail's Gemini and Apple Intelligence now scan incoming messages and surface short summaries directly in the inbox, before the reader even opens anything. That changes the rules of first impressions.

Your subject line and preheader still matter. They always will. But they're no longer the whole story.

The first two sentences of your email body are now inbox real estate.

Google's Gemini in Gmail generates summary cards that can appear at the top of email content, pulling from the opening lines of your message. Apple Intelligence does the same thing — showing a short preview under each email in the inbox list, then again at the top of the screen when the message is opened. Both systems weight the beginning of your email heavily when deciding what to surface.

Which means if your email opens with "Hi! Hope you're having a great week!" — that's what the AI works with. And that's not much to go on.

Enter the signal phrase.

A signal phrase is a short structural cue that leads your email. It tells the reader — and the AI summarizing your email — exactly what the message is about and why it matters.

Some useful examples:

1. What's included:
2. Offer ends:
3. Your next step:
4. Important update:
5. Tomorrow:

These aren't gimmicks. They're clarity. They remove the guesswork.

Attentive's research recommends treating the first 100–200 characters of your email body as "inbox-critical content" — placing your primary benefit or key message in the opening one to two sentences, specifically because that's where AI summary tools focus.

What this looks like in practice.

Instead of:

Hi, I hope you're having a great week.

Try:

What's included: A simple May retirement income checklist — review your plan before summer in under 10 minutes.

One is filler. The other earns its place.

For educational newsletters in particular, "What's included:" is one of the most useful phrases in the toolkit. It sets expectations, signals value, and gives readers a reason to keep going.

Why does this matter to me, right now?

When your email answers that question in the first line, everything else gets easier. Readers scan faster and stay longer. AI tools summarize more accurately. And in a crowded inbox, your message stands out not because it's louder — but because it's immediately, obviously useful. And In practical terms, that means the first readable words in your email may be worth an 8% to 14% open-rate advantage when used well.

That's the bar worth clearing.