Email Marketing Best Practices That Drive Real Results

Email remains one of the highest-ROI marketing channels. Learn how to write emails that get opened, read, and acted upon.

Onikey Team
3 min readOctober 25, 2025

With an average ROI of $42 for every $1 spent, email marketing remains one of the most effective channels available.

But sending emails is easy. Sending emails that get results requires strategy. Here is what actually works.

Start with the Subject Line

Your subject line determines whether your email gets opened or ignored. It is the most important copywriting in your entire campaign.

What Works:

  • Curiosity gaps ("The mistake killing your conversions")
  • Specific benefits ("Save 10 hours this week with...")
  • Personalization (name, location, past behavior)
  • Urgency when genuine (not fake scarcity)
  • Questions that resonate with pain points

What to Avoid:

  • ALL CAPS and excessive punctuation!!!
  • Spammy words (FREE, guaranteed, urgent)
  • Misleading promises
  • Generic, boring subjects

Write for One Reader

The best emails feel personal, like they were written just for you. Use "you" frequently. Write conversationally.

Imagine you are writing to one specific person who represents your ideal customer.

One Email, One Goal

Every email should have a single, clear objective. Want them to read a blog post? Click through to a product? Reply with feedback?

Multiple CTAs dilute attention and reduce action.

The Power of Story

Humans are wired for narrative. Starting with a short story or example draws readers in and makes your point memorable.

Even B2B emails can benefit from storytelling.

Mobile-First Formatting

Over 60% of emails are opened on mobile devices. Your emails must be readable on small screens:

  • Short paragraphs (2-3 sentences max)
  • Plenty of white space
  • Large, tappable buttons
  • Preview text that hooks

Timing and Frequency

There is no universal "best time to send." Test different times and days for your specific audience.

For frequency, err on the side of less. It is better to be anticipated than to be annoying.

Segmentation Is Non-Negotiable

One-size-fits-all emails underperform. Segment by:

  • Purchase history
  • Engagement level
  • Demographics
  • Source of signup
  • Stage in customer journey

Always Be Testing

Test subject lines, send times, CTAs, content length, and formats. Let data guide your decisions.

Even a 10% improvement in open rates compounds into significant results over time.

Clean Your List Regularly

Dead subscribers hurt deliverability. Regularly remove people who have not engaged in 6-12 months.

A smaller, engaged list beats a large, dead one.

Deliverability Basics

Your emails cannot convert if they land in spam. Maintain deliverability by:

  • Using a reputable email service provider
  • Authenticating your domain (SPF, DKIM, DMARC)
  • Maintaining a clean, engaged list
  • Avoiding spam trigger words

Conclusion

Email marketing rewards those who respect their subscribers time and attention. Send valuable emails to engaged people, and results will follow.

Focus on providing value first, and the conversions will come.

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