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A subject line may seem like a minor detail in the overall scheme of your email marketing success but it can make or break a campaign.

Your emails should focus on adding value to the customer experience, delivering the right message, at the right time. They should also answer questions and resolve your customers 'pain points'. A value-first strategy in your email strategy will lead to increased sales, better brand recognition and higher open rates.

Plus email marketing has reach and influence. Especially when 93% of people say they use email every day and 42% check their inboxes three to five times a day, according to ZeroBounce’s Email Statistics Report for 2025.

So, don't let your emails go to waste. Read our some tips for crafting the perfect subject line to increase open rates, boost ROI .

Whether you’re working for a small business selling custom t-shirts or sitting pretty at a leading, multinational brand, there are a few key best practices for email subject lines that are universal. 

• Create urgency: Making subscribers feel like there’s a time crunch can work wonders. But beware, too many of these can lead to list exhaustion, so use them sparingly.
• Promote offers: People love new things and experiences, so play on that. Offer them a something free, or give a substantial discount. They’ll see the value in continuing to subscribe to your email list.
• Reward loyalty: Value your customersby giving them something back for thei loyelty such as VIP discounts, early bird deals or exclusive competition offers.  
• Curiosity: Pique your recipients’ natural curiosity by making them open the email to get more information.
• Self- interest: Use these subject lines most frequently; they are usually direct and speak to a specific benefit your audience will receive by opening the email. Self-interest subject lines also help pre-qualify openers by hinting at your email’s body content.