From name, subject line and preview

Three lines decide whether an email is opened: who it's from, the subject line and the preview text. Readers take them as one sentence, in about a second.

The short version

• The from name is the first trust check. Use a name the reader knows, and keep it the same every time.
• A person's name invites a reply; the brand's carries an offer. "Sam at Northwind" for welcomes and sequences, "Northwind" for sales and newsletters.
• Say what's inside and why it matters. The best subject lines tell what's inside; the worst sell it.
• Put the deciding words in the first 33 to 40 characters. That's all a phone shows. Length itself barely matters.
• Be specific: a number, a name, a day, an amount.
• Always write the preview text, and make it add a second reason, never repeat the subject.
• Urgency only when it's true. "Still time" beats "extended".
• One emoji at most, and the line must make sense without it.
• Never disguise an email: no fake "RE:", no promotion dressed as a receipt or an alert.
• The headline inside keeps the subject line's promise.

What the inbox shows

In the inbox, the eye takes, in order, who it's from (and in Gmail, Yahoo and Apple Mail, a logo when the sender has set one up), the subject line, the preview text, and the time.

How much shows, measured on real phones and screens by EmailToolTester (August 2026):

To show a whole subject line on every major phone, it has to fit in 33 characters. Anything after about 40 is a bonus for people on a computer. Watch where a phone cuts the words: "license" cut short becomes "lice".

Some inboxes now show a machine summary in place of the preview: Apple Mail with Apple Intelligence, and Gmail and Yahoo when the reader asks for one. A summary is drawn from the email's text, so put the main point and the offer in the headline and the first lines as real text, never inside a picture.

The from name

It's the first trust check. People decide whether an email is welcome by who sent it, before they read what it says. In a 2016 Litmus survey of 1,361 US adults, the sender's name had the biggest single effect on whether people opened.

Keep it stable. Readers learn it. Changing it from send to send throws that away, and can look like someone else.

A person or the brand:

In HubSpot's own test, a person's name beat the company name by 0.53 points on opens and 0.23 points on clicks, worth more than 130 extra leads in that one send.

Replies should reach a person. A "noreply" address tells the reader the conversation goes one way. When an email asks for a reply, the reply must land in an inbox someone reads.

The subject line

Its job is to win the open from the people the email is for, by saying what's inside and why it matters to them. Not to trick anyone in. Mailchimp's early analysis of about 40 million emails put it plainly: the best subject lines tell what's inside, and the worst sell what's inside. In Return Path's study of 9 million subject lines (2015), clickbait words did worse: "secret of" read 8.69% below the same senders' other subject lines.

An unopened subject line still works as a small advert. In the Litmus survey, more than a third of people had visited a shop or website after getting an email they never opened.

Length isn't the lever; the first words are. Return Path found no link at all between length and reading (9 million subject lines from 3,000 retail senders, 2015). Studies that did find a best length disagree with each other. What they all support: say the point first.

Clarity first, then a measured gap. Curiosity works only when the reader knows enough to care. Name the subject and the benefit, and hold back one thing they want to know. "The 3-minute fix for an engine that won't start in the cold" is a gap with a topic. "You won't believe this" is a gap with nothing in it.

Specific beats general. A number, a name, a place, a day, an amount let the reader judge at a glance whether it's for them. Numbers help most when they're a real part of the offer: the discount, the deadline, the count of items in a list.

A name, or what they did. A first name in the subject lifted opens by about 20% and sales leads by 31% in field experiments at three firms (Sahni, Wheeler and Chintagunta, Marketing Science, 2018). But in a study of 10 million email ads from one retailer, a greeting by name drew a negative response from most customers, while recommendations from what they'd bought drew a positive one (Information Systems Research, 2012). So personalise first with what the person did or wants: the product they looked at, the course they started, their town, their booking. Use the first name now and then, where a person would.

A question only when it's theirs. "Is your roof ready for winter?" picks out the people it's for. "Want to save money?" doesn't. Answer it in the first lines of the email.

One emoji at most. In Nielsen Norman Group's user research (2020), adding an emoji to the same subject line didn't make people more likely to choose it, and it raised negative feeling toward that email by 26%. Screen readers read an emoji out by name ("party popper"), so the line must make sense without it.

Urgency works when it's true. In Return Path's data, "still time" read 15.54% above the senders' other subject lines and "limited time" 3.05% above, while "extended" was 2.95% below. A deadline that keeps moving teaches readers to ignore deadlines.

There's no list of banned words. Mailbox providers judge your reputation and how readers react, not single words. What still hurts: capitals throughout, rows of "!!!" or "$$$", and anything made to deceive.

Never disguise what the email is. No fake "RE:" or "FWD:", no subject made to look like a receipt, a security alert or a personal message when it's a promotion. In the United States the subject line must reflect what's in the email, and each email in breach can cost up to $53,088.

Fit the type. A receipt says what it is: "Your order #4417 is on its way". A newsletter leads with its best item. An offer puts the offer and its end first. A sequence email reads like a person wrote it: short and plain.

Sound like the business. A luxury shop names the designer, never the discount. A discount shop pairs the two. A brand known for its humour can be funny.

Patterns that work

And what to avoid: "You won't believe this…", "RE: your account" on a promotion, "LAST CHANCE!!!", "Hi FNAME", "Newsletter #47", and the same subject line sent again to the people who didn't open.

The preview text

Always write it. Left empty, the inbox fills it with whatever comes first in the email: "View this email in your browser", a picture's description, a menu, a legal line.

It continues the subject line; it never repeats it. Read the two as one sentence: the subject makes the claim, the preview adds the second reason or the detail. Subject: "Your winter roof check, booked in 2 minutes". Preview: "Pick a morning this week. We send a photo report the same day."

The point in the first 35 to 40 characters, under about 90 in all.

The headline inside

It keeps the subject line's promise, in the same words or close to them. A subject about "your winter roof check" and a headline about "Spring savings on gutters" breaks the thread, and the reader leaves.

Write it hardest. Litmus measured the average time spent on an email at 11.8 seconds (2020). In that time most people take in the headline, the picture, the button and little else. One idea, one benefit, in real text, two lines or fewer on a phone (about 40 to 50 characters).

Before you send

Subject line: says what's inside and why it matters · the deciding words in the first 33 to 40 characters · one specific · the topic is clear even if something is held back · personal details present for everyone · one emoji at most · any deadline is the real one · nothing disguised · sounds like you.

Preview: written · adds a second reason · the point in the first 35 to 40 characters.

From name: one they know, the same as last time · a person for relationship emails, the brand for offers · replies reach a person.

Headline: echoes the subject line · one idea, real text, two lines or fewer on a phone.

Doing it here

• Every campaign goes out as at least four versions, each with its own subject line, and each person gets one. You can edit every subject line and preheader: How your emails are written.
• So every campaign tests its subject lines for you. The report shows which won: What your results count.
• You type the name people see when you choose who it's from, and replies go to an address you've verified, an inbox you already read: Verify your reply-to address.
• Every reply to a campaign lands in one inbox: One inbox for every reply.