How to Use Email Preheaders to Boost Open Rates and Revenue

The email preheader (also called preview text) is the short line of text that appears next to or below your subject line in most email clients. It's the second most important factor in whether someone opens your email — yet most marketers either ignore it or leave it as default text ("View this email in your browser"). Here's how to use preheaders to significantly boost your open rates.

What is an Email Preheader?

The preheader is typically 40-90 characters of text extracted from the beginning of your email body (or specified separately in your email's HTML). In Gmail, it appears after the subject line in gray. In Outlook and Apple Mail, it shows as preview text in the inbox list.

How to Write Effective Preheaders

• Complement the subject line: Don't repeat it — extend it. Subject: "Your order shipped" → Preheader: "Track package #12345 — arrives Thursday"
• Create curiosity: Subject: "Big news" → Preheader: "We've been working on this for 6 months"
• Add urgency: Subject: "Last chance" → Preheader: "This offer expires tonight at midnight"
• Include key details: Subject: "New blog post" → Preheader: "How I made $5,000 from my email list last month"
• Keep it 40-90 characters: Longer text gets truncated on mobile devices

Technical Implementation

Set preheader text using the HTML <meta name="x-apple-disable-message-reformatting"> tag or by placing hidden text at the very top of your email HTML. Make sure your email delivery works reliably — test your SMTP with PayPaell's SMTP Checker and validate your list with PayPaell's Email Validator so your精心crafted preheaders actually reach the inbox.

Conclusion

Preheaders are a free, easy optimization that can increase open rates by 10-25%. Always write a custom preheader for every email. It takes 30 seconds and can mean thousands of additional opens over time.