Email deliverability is critical to the success of your outreach campaigns. If your emails don't land in your leads' inboxes, they won't be opened, no matter how good your messaging.

This guide will help you test, verify, and improve your email deliverability using Mail-Tester and MXToolbox, two trusted tools for inbox monitoring. Before launching a full campaign, these methods let you confidently check if your emails are being delivered correctly.

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It refers to your ability to reach the inbox instead of the spam folder. Several factors influence this, including domain authentication (SPF, DKIM, DMARC), sender reputation, and content quality.

Always verify your deliverability health before launching or scaling campaigns, especially if you're sending cold emails from new or warmed-up inboxes.

Mail-Tester.com provides a free and instant way to test if your emails are likely to land in the inbox.

When you send a test email to their temporary inbox address, Mail-Tester returns a score out of 10 along with specific feedback related to:

Add Mail-Tester as a Lead and Run a Test Campaign. This method simulates a real sending scenario and is ideal for testing the full setup.

Step 1: Visit Mail-Tester.com and copy the temporary test email address (e.g., [email protected])

Step 2: Go to your Leads list and the Actions button, and Add manual Leads option.

Step 3: Enter the First and last name and paste the temporary test email address, and add lead.

Step 4: Once added, go to the Campaign option.

Step 5: Navigate to Campaigns and either create a new one or open an existing sequence.

Step 6: Assign the “Testing List” as the target.

Step 7: Launch the test campaign, click on the Create AI Agent button, and wait a few minutes.

Step 8: Go back to Mail-Tester and click the Then check Your Score button.

You'll see a full report with:

Use “Send Test Email” From a Sequence. This method is quicker and ideal if you only want to check the content of a specific email template.

Step 1: Visit Mail-Tester.com and copy the test email.

Step 2: Go to Campaigns and select a campaign.

Step 3: Go to the Sequence tab and the Add Step button.

Step 4: Open the email template and create a test mail. For more information, refer to the Campaign Sequence Setup document.

Step 5: Once the mail is created, click on the Sent test mail button.

Step 6: Paste the Mail-Tester email as the recipient and choose the sender’s email, then send it.

Step 7: Go back to Mail-Tester and click the Then check your score button.

Read through the results to identify authentication, content, or domain issues.

MXToolbox.com offers deeper insights into your domain’s/email’s technical health. It’s especially helpful if you suspect DNS or blacklisting issues.

Just paste your domain name or email address into their tools and review the results.