Preview text belongs to the cold email's opening, even though it sits outside the main writing task. Write it to complete the subject line and earn the click into the email. If preview text is unset, the client fills it with the first text it finds, turning the start of the body into an accidental inbox message.1 Before opening, the recipient sees the sender, subject line, and preview line.2 Treat the opening sentence as both inbox copy and email copy.3 Judge the subject and preview together before polishing the rest.
Start with the inbox row
The inbox row is where the opening decision starts, and the body earns attention after this small piece of copy has done its work.
An email preheader, also called preview text, is the snippet displayed in the inbox, usually below the subject line.4 It previews the message and supplements the subject before the email opens.5 The subject line and preview text affect whether the email is opened because the recipient sees them first.6
Read the row as a recipient would and ask what the two lines communicate together. Does the subject create a clear starting point? Does the preview give the reader a useful reason to continue? If the lines feel disconnected, fix the preview before polishing the body.
Give the preview a job
The preview should continue the subject's thought. Decide what belongs there before choosing the wording.
Ask yourself:
- What does the subject leave unanswered?
- What would make the message feel relevant to this recipient?
- Does the reader need context, an offer, or a next step to understand why the email deserves attention?
Write the preview to answer one of those questions. It should add a reason to open, clarify the offer or next step, and make the email feel relevant before the reader clicks.7
Keep the subject and preview distinct. A preview that repeats the subject uses the visible space without giving the reader another reason to continue.8 Read both lines aloud and remove any phrase that merely says the same thing twice.
Write the displayed line first
Start drafting with the line you want the inbox to show. That keeps the opening from becoming an accidental byproduct of the body.
In a plain-text cold email, the first sentence is the preview text.3 Email clients preview the subject line and roughly the first line or two of the email, about the first 25 words.9 Write that opening so it makes sense beside the subject while the rest of the message is hidden.
Put useful context first. The visible slice may stop before the reader reaches the rest of the sentence, so the opening should carry its meaning early. Avoid making the reader reconstruct the point from setup that reaches the reason later.
With HTML, you can set the preview copy explicitly with code. Clients also often draw the preview from the beginning of the email body.10 Use the setup your sending process supports, then inspect the actual inbox row to confirm that the intended text appears.
Check before you send
Run this check with the body closed. You are testing the reading experience in the inbox, where the recipient decides whether the message deserves more attention.
A recipient may see only one line before deciding whether to click into a cold email.11 Read the subject and preview as a complete thought, then check the visible opening on its own.
Use this pass:
- Read the subject without the preview. Notice what information is missing.
- Read the subject and preview together. Confirm that the preview adds context instead of echoing the subject.
- Read only the opening slice. Make sure it still gives the recipient a reason to continue if the rest is hidden.
- Open the full message and check that the body follows through on the context promised in the preview.
- Review the row in the inbox views your recipients use. Look for awkward clipping, a broken sentence, or an opening that sounds accidental.
Move on when the row makes sense on its own and the body continues naturally from it. The preview should earn the click without carrying the entire email.
What not to do
These mistakes leave the inbox row doing work your draft should have handled.