1️⃣ What Works in Email Subject Lines

• Bonuses outperform product messaging

Around 27% of subject lines focus on an immediate reward rather than the product itself.

Examples:

  • We Saved Something for You

  • Claim Your Bonus

  • Special Gift

  • Exclusive Offer

• Personalization is almost the standard

About 23% of subject lines include a personalized element, such as:

  • Your...

  • For You

  • We Saved...

  • Your Reward

• Urgency is used sparingly

Only 7–8% of subject lines rely on FOMO:

  • Now

  • Last Chance

  • Today

  • Final Hours

  • Never

Interestingly, most emails don't use deadlines at all.

• Keep it short

  • Average subject length: ~38 characters

  • Most fit on a single line in mobile inboxes.

• Questions are rare

Only about 6% of subject lines are written as questions.

Instead of creating curiosity, most emails promise value immediately.

2️⃣ The Most Common Bonus Types

The most frequently promoted offers are:

  • Cash bonuses

  • Free Spins

  • Cashback

  • Deposit bonuses

  • Personalized bonuses

  • Reload bonuses

  • VIP offers

  • Tournaments

3️⃣ Typical Bonus Values

Free Spins

  • Median: 30 FS

  • Average: 100 FS

Most common amounts:
20 / 30 / 50 / 100 / 150 / 200

Cashback

  • 10%

  • 15%

  • 25%

Deposit Bonuses

  • 100%

  • 125%

  • 150%

  • 200%

  • 300%

4️⃣ Email Structure

Almost every email follows the same layout:

  1. Headline

  2. Large hero banner

  3. Short offer

  4. Terms & conditions

  5. Primary CTA button

  6. (Sometimes a repeated CTA)

  7. Footer

Common characteristics:

  • Minimal copy

  • One clear value proposition

  • One primary CTA

  • No long storytelling

The most common CTA buttons are:

  • Play Now

  • Claim Bonus

  • Deposit Now

  • Claim Now

  • Collect

  • Get Bonus

The CTA always encourages an action that leads directly to a reward.

5️⃣ Design & Presentation

  • Typically 5–10 links per email (including footer and system links)

  • Very few emojis

  • One screen = one message

  • Usually a single offer per email

Additional Insights

  • They sell emotion, not the product.

  • Almost every email includes a clear call to action.

  • Cognitive load is kept to a minimum.

  • Simplicity wins.