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envelopeEmail Marketing - How to use Mail-Tester to improve your email score

The Mail-Tester is an online tool that analyzes the sending quality of your email and assigns a score from 0 to 10. This score indicates whether your message has a good chance of reaching the inbox or may land in spam.

Below, see the step-by-step to use the tool and improve your sends through SprintHub.

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1️⃣ Accessing Mail-Tester

  1. Visit the site:

LogoNewsletters spam test by mail-tester.comwww.mail-tester.comchevron-right

  1. The platform will automatically generate a temporary test email address.

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2️⃣ Sending the test email through SprintHub

  1. Access your SprintHub dashboard

  2. Menu >> Analyze >> Email or type Email in the field “Find service” and the function will appear for quick access.

  3. Create a new test send

  4. Copy the email generated by Mail-Tester

  5. Paste it as the recipient

  6. Send the message as usual

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3️⃣ Analyzing the result

After sending:

  1. Return to the Mail-Tester site

  2. Click on “Then check your score”

  3. The tool will display:

  • ✅ Final score (from 0 to 10)

  • 🔎 SPF check

  • 🔎 DKIM check

  • 🔎 DMARC check

  • 📄 Message content analysis

  • 🚫 Blacklist checks

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4️⃣ What does each item mean?

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🔐 SPF (Sender Policy Framework)

Validates if the server that sent the email is authorized by your domain.

If it shows an error:

  • Check your domain's DNS configuration

  • Confirm that the SPF includes SprintHub's server

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🔏 DKIM (DomainKeys Identified Mail)

Adds a digital signature to the email to validate authenticity.

If it shows an error:

  • Check if the DKIM key was added correctly in DNS

  • Confirm it is active in SprintHub

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🛡️ DMARC

Defines policies to protect against email spoofing.

If it shows an error:

  • Configure a DMARC record in DNS

  • Use an initial policy like: p=none for monitoring

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✉️ Message Content

Mail-Tester also analyzes:

  • Excessive use of words like “FREE”, “PROMOTION”, “URGENT”

  • Many shortened links

  • Many images and little text

  • Lack of a plain text version

  • Overly sensational subject line

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5️⃣ Best practices to improve your score

✅ Correctly configure SPF, DKIM and DMARC ✅ Use a custom domain (avoid Gmail/Hotmail for sends) ✅ Avoid link shorteners ✅ Use natural language ✅ Maintain a balance between text and images ✅ Always include an unsubscribe option ✅ Send to cleaned lists

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🎯 What score is considered ideal?

  • 9 to 10 → Excellent

  • 8 → Good

  • 7 or less → Needs adjustments

Ideally keep it above 8 to ensure good deliverability.

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🚀 Extra Tip

Whenever:

  • Configuring a new domain

  • Changing DNS

  • Switching sending server

  • Creating an important campaign

Run a test on Mail-Tester before sending to your full list.

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