Email is a powerful marketing channel, but without analysis, its effectiveness turns into guesswork. Which emails actually work? Why do some campaigns bring in leads while others just burn through the budget?

At Letteros, we believe: strong email marketing = great content + strong analytics. That's why Letteros has a built-in reporting system that helps you understand which campaigns are delivering results and which ones need a rework.

We'll explain how to properly analyze your campaigns and which metrics to watch in order to grow.

Why analyze your campaigns?

  • To understand which subject lines, offers, and designs work.
  • To catch weak spots early: low Open Rate, low CTR, high churn.
  • To optimize content and segmentation.
  • To lower lead cost and increase conversion.
  • To make decisions based on data, not intuition.

Which metrics matter

At Letteros, we highlight several key groups of metrics:

1. Engagement metrics

  • Open Rate (OR) — how many people opened the email.
  • Click-Through Rate (CTR) — how many people clicked something inside the email.
  • Click-to-Open Rate (CTOR) — the ratio of clicks to opens.
  • Unsubscribes — how many people opted out of the campaign.

2. Conversion metrics

  • Number of leads / purchases from the campaign.
  • Click-to-lead conversion rate.
  • Average order value / campaign revenue.

3. Technical metrics

  • Bounce Rate — the share of emails not delivered to recipients.
  • Spam Complaints — spam complaints.
  • Delivery Rate — the share of successfully delivered emails.

How to collect data

In Letteros, it couldn't be easier:

  • Built-in analytics automatically collects OR, CTR, CTOR, and unsubscribes.
  • Integrations with CRM, CDP, and ESP platforms let you pull in purchase and lead data.
  • You can build reports by individual campaign, segment, template, or specific module.

How to analyze the results

1. Compare similar campaigns

Compare emails by type (promo, welcome, reactivation), segment, and send time.

2. Track trends

Look at the trend over weeks and months: are OR and CTR growing? Is churn dropping?

3. Investigate anomalies

A sharp drop in opens? Check the subject line, sender, and deliverability.A lot of unsubscribes? Check whether your sending frequency has changed.

4. Test

A/B/C/D tests help you pick the best subject lines, buttons, and banners.

How this helps the business

  • Marketers: see what actually works and scale it up.
  • Owners: keep track of return on investment.
  • CRM specialists: optimize segmentation and improve behavioral analytics.

With Letteros, all of this happens without Excel, scripts, or manual reports. Everything in one window.

How we work with clients

When we launch a project, at Letteros we:

  1. Set up analytics tailored to the client's business goals.
  2. Train the team to read and use the data.
  3. Help set up regular reports (weekly, monthly).
  4. Suggest improvements based on the data.

Conclusion

Email analytics isn't a luxury — it's a must-have for modern marketing.Letteros turns data into action: you see what works, and you scale success.Stop wasting time on guesswork — start making decisions based on data.

Want to see the real effectiveness of your email campaigns?

Ready to speed up your campaigns and stop relying on developers?👉 Request a demo of Letteros👉 Sign up and start testing👉 Get in touch — we'll help adapt a master template to your brand👉 Subscribe to our blog — we share our experience and case studies