Promotional Emails: What to Include, How to Write One, and Common Mistakes

A promotional email is a direct sales message sent to your subscriber list. Done right, it drives clicks, conversions, and revenue. Done wrong, it gets deleted or, worse, lands you in the spam folder. Here’s exactly what to include, how to write one that works, and the mistakes that kill your results.

What to Include in a Promotional Email

Every promotional email needs seven core elements. Miss one, and you risk losing the reader.

• Compelling subject line. This is your first impression. Use action-oriented language, create curiosity, or mention a specific benefit. Example: "50% off ends Friday" or "Your exclusive early access is live."
• Preheader text. The short text snippet after the subject line. Don't leave it blank. Use it to reinforce the offer. Example: "Shop the sale before it's gone."
• Clear value proposition. Within the first sentence, state exactly what you're offering and why it matters. "Get 20% off all winter coats" is direct. "We're excited to share our new collection" is vague.
• One primary call-to-action (CTA). A single button or link that tells the reader what to do. Use contrasting colors and action words: "Shop Now," "Get Your Discount," "Claim Your Spot." Don't clutter the email with multiple competing CTAs.
• Visual hierarchy. Place your logo at the top, the offer in the middle, and the CTA where it's easy to tap. Use white space to separate sections. A cluttered design hurts readability.
• Social proof. Include a short testimonial, a star rating, or a "Join 5,000+ happy customers" line. This builds trust and reduces hesitation.
• Compliant footer. Your business name, physical address, and an unsubscribe link. Required by law in most jurisdictions. No exceptions.

How to Write a Promotional Email That Converts

Start with the subject line. Write five options, then pick the one that's most specific and benefit-driven. "Save $50 on your next order" beats "Check out our deals."

Open the body with a single sentence that restates the offer and its value. For example: "For the next 48 hours, take 30% off all leather bags." No fluff, no "we hope this email finds you well."

Keep the body text under 125 words. Use short paragraphs. Bullet points work well for listing product features or event details. Every sentence should push the reader toward the CTA.

Use one image that supports the offer—a product photo, a screenshot, or a branded graphic. Avoid stock photos. They look generic and reduce trust.

Make your CTA button large enough to tap on a mobile screen (at least 44x44 pixels). Place it above the fold and again near the bottom. Use action verbs. "Redeem Your Offer" is stronger than "Learn More."

Common Mistakes That Ruin Promotional Emails

Weak subject lines. Generic subject lines like "Newsletter" or "March Update" get ignored. Test subject lines with a small segment of your list before sending to everyone.

Too much text. A wall of text overwhelms readers. They scan, not read. Cut your copy by 50% and see if the offer is still clear.

No mobile optimization. Over 60% of emails are opened on phones. If your email doesn't render well on a small screen, you lose the reader. Use a single-column layout and large fonts.

Forgetting the preheader. Many businesses leave the preheader blank, showing "View this email in your browser" or the first few lines of the body. Customize it. It's prime real estate.

Hiding the unsubscribe link. This is both a legal risk and a trust killer. Make it easy to find. You want people who aren't interested to leave, not mark you as spam.

Sending too often. One promotional email per week is a safe starting point. More than that, and you risk fatigue. Track your unsubscribe rate after each send.

How to Measure Success

Track open rate, click-through rate (CTR), and conversion rate. A good open rate for promotional emails is 15-25%. CTR should be 2-5% or higher. If your open rate is high but CTR is low, your offer or CTA is weak. If both are low, your subject line or list targeting needs work.

Test one variable at a time—subject line, CTA color, offer wording. Small changes can lift conversion by 10-20%.

Final Practical Tips

• Send from a real person's name, not a company name. "Sarah from Brand" gets higher opens than "Brand News."
• Segment your list. Send different offers to new subscribers vs. repeat buyers.
• Always include a clear expiration date or urgency. "Offer ends Sunday" works. Fake urgency ("Last chance... for the 5th time") destroys trust.