How to fix WP Mail SMTP not sending test email

How to Fix WP Mail SMTP Not Sending Test Email

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Are you experiencing issues with WP Mail SMTP not sending test emails? Don’t be alarmed because this is a fairly common problem.

WP Mail SMTP is essential for reliable email delivery from your website. However, just like any tool, minor problems do occur (that have very quick fixes).

In this guide, we’ll walk you through some of the most common problems with WP Mail SMTP to get your test email flying out effortlessly!

How to Fix WP Mail SMTP Not Sending Test Email

Here are some of the most common fixes for WP Mail SMTP not sending test email on your WordPress website:

1. Check Your SMTP Mailer Settings

Remember, WordPress uses PHP by default for sending emails from your website, which usually doesn’t offer good email deliverability.

Therefore, if you’ve installed WP Mail SMTP, but you’re still using the default PHP Mailer, the plugin is not controlling your emails.

WP Mail SMTP is compatible with both paid and free SMTP service providers. To select a mailer, go to WP Mail SMTP » Settings.

Additional mailer connections in WP Mail SMTP

This is a crucial step because it’s necessary to use a different mailer than PHP for the test and other emails to be sent out successfully.

2. Verify All Settings Are Accurate

Once you’ve made your choices, there are more settings to be dealt with. Move on to the authentication process by reviewing the documentation in the table below.

Mailers available in all versions Mailers in WP Mail SMTP Pro
SendLayer Amazon SES Microsoft 365 /
Brevo Zoho Mail
Google Workspace / Gmail
Other SMTP

Though many choices are available, we suggest using SendLayer,, or Brevo (previously Sendinblue).

When it comes to sending transactional emails, these mailers are some of the most reliable choices out there.

Need a hand?

You can purchase White Glove Setup as an additional service with any of our WP Mail SMTP licenses and have our customer support team set up WP Mail SMTP for you.

Ensure you’re following each step of your mailer setup guide thoroughly and carefully, and check out all values for any typos!

3. Choose the Right Email Sender

Though many mailers allow you to choose your sender email, not all email addresses work equally well.

Ensure you refer to the guidelines of your chosen mailer for recommendations on the ‘From Email.’

Most mailers and their ‘From Email’ requirements strongly recommend using a domain-specific email for greater reliability.

configure from email

4. Use the ‘Force From Email’ Option

When you install different plugins, they all might have different ‘From Name’ and ‘From Email’ settings, which may cause issues with deliverability.

To fix this, WP Mail SMTP offers an easy solution in the shape of forcing the ‘From Email’ address for all plugins across your WordPress site.

Under WP Mail SMTP » Settings, there’s an option to ‘Force From Email.’ Activate it to ensure your email plugins have a consistent ‘From Email.’

Force From Email in WP Mail SMTP

Remember that if the ‘Force From Email’ checkbox is disabled, your chosen mailer is already forcing the ‘From Email’ to be utilized across the website.

5. Change the Encryption Method (TLS or SSL)

If you’re using Other SMTP to use a transactional mailer service like Mandrill, try changing the encryption method to TLS.

It is quite common for the test email and other notifications from your website to fail if the encryption method selected is incompatible with the mailer. Since SSL is becoming obsolete, using SSL can cause emails to Gmail addresses to be blocked.

To get a better idea about which encryption method you should be using with your mailer, refer to this detailed guide on SMTP settings.

Enter Mailchimp SMTP details into WP Mail SMTP

6. Update WP Mail SMTP to the Latest Version

It is normal for most plugins, including WP Mail SMTP, that haven’t been updated in a while to start acting up a bit.

Therefore, if your test emails are not sending from WP Mail SMTP, make sure you have the latest version installed to rule out any outdated plugin issues.

Regular updates provide enhanced functionalities and also resolve pre-existing issues. Just head to Dashboard » Updates to see if an update is available.

Update WP Mail SMTP

7. Use the Latest Version of WordPress

As important as it is to keep WP Mail SMTP up to date, you should also make sure you have the most recent version of WordPress.

To ensure that the plugin is compatible with the most recent version of WordPress, WP Mail SMTP uses the best coding practices.

To check if an update for WordPress core is available, log in to your site and go to Dashboard » Updates.

If you see a notice that reads, “An updated version of WordPress is available,” you might want to update to the latest version.

Update WordPress website

8. Ensure You’re Running PHP 5.6. or Above

Sometimes, it’s the hosting service causing glitches that may prevent the test email from being sent. The WP Mail SMTP plugin requires at least PHP 5.6.

However, for optimum performance and security, it’s recommended to have PHP 7.3 or greater, whatever your web hosting service provides.

To find out what PHP version your website uses, from your WordPress dashboard, go to Tools > Site Health > Info > Server.

WordPress php version

9. Check for Conflicts with Other Plugins

Like any other WordPress plugin that may start malfunctioning due to a ‘conflict of interest,’ having more than one SMTP plugin can cause problems.

From your WordPress dashboard, head to the plugins page and ensure only one SMTP-related plugin is active. Deactivate any conflicting plugins!

10. Still Facing Issues? Time for Some Help!

If the problem persists, WP Mail SMTP Support is at your service. When reaching out:

  • Provide your name, email, and specific details about the problem.
  • Share a URL or granting site access can expedite the resolution.
  • Ensure you’ve given them an ‘Administrator’ role if sharing credentials.
  • Offer a concise description of the issue for clarity in the message box.
  • Once ready, hit Submit. The support team will get back to you ASAP!

More Questions about WP Mail SMTP Not Sending Test Email

Here are some common questions and their answers regarding WP Mail SMTP not sending email test in WordPress.

Why is my WP Mail SMTP email not working?

WP Mail SMTP issues can arise from several factors. Most commonly, incomplete setup, misconfigured mailer options, or outdated plugin versions can cause it.

Solution: Double-check the WP Mail SMTP server setup, ensure you’re not using PHP Mailer as your email provider, and update the plugin to the latest version.

Why is SMTP not sending emails?

SMTP might not send emails due to wrong server configurations, incorrect port numbers, or security protocols not matching. I

f you’re using WP Mail SMTP, getting to the root of the problem is incredibly easy. Just contact the support team, and they should have you up and running within no time.

Why is my WP site not sending emails?

Your WP site might not send emails due to theme or plugin conflicts, hosting restrictions, or PHP mail function issues.

What is there was a problem while sending the test email in WordPress?

This usually hints at a configuration error. It could be related to the email address you’re trying to use, incorrect SMTP host details, or an issue with your hosting provider.

Next, Learn About the Differences between WP Mail SMTP Lite and Pro

Want to know how WP Mail SMTP Lite and Pro are different? Looking for advice on picking the right plan? Since WP Mail SMTP is one of the most reliable SMTP plugins for WordPress, it’s vital to choose a version that fits the needs of your business.

Fix Your WordPress Emails Now

Ready to fix your emails? Get started today with the best WordPress SMTP plugin. If you don’t have the time to fix your emails, you can get full White Glove Setup assistance as an extra purchase, and there’s a 14-day money-back guarantee for all paid plans.

If this article helped you out, please follow us on Facebook and Twitter for more WordPress tips and tutorials.


  1. Heads up! The last email your site attempted to send was unsuccessful.

    Email Source: WPForms Lite
    Mailer: Other SMTP
    SMTP Error: The following recipients failed: ********(Mail ): Messages to this domain name are blocked.

    I don’t know how to solve this problem, I consulted many posts, but none answered my question, please help! !

    1. Hi Geoffrey,

      The error message indicates that your email sent to that particular recipient’s domain is being blocked. This could be due to several reasons:

      – The recipient’s email server could be rejecting emails from the sender’s domain.
      – There might be a misconfiguration in the sending email server.
      – The recipient’s email server could have added the sender’s email or IP address to a spam list.

      I would recommend the following steps for troubleshooting:

      – Verify your WP Mail SMTP -> Settings and see whether you can send and receive a test email (WP Mail SMTP -> Tools).
      – Check your domain reputation using this tool. This tool will help you to check if your sender’s domain or IP is on any blacklists.

      Alternatively, you could configure a different mailer provider on your site to enhance your email deliverability. You can see all the available mailers from here.


  2. I’m encountering a problem with the contact form on my WordPress website, which is built with the Divi theme. Despite successfully submitting forms on the site, no emails are being sent to my inbox.

    I’ve taken steps to address this by installing the WP Mail SMTP plugin. My email, which is part of Google Workspaces, is functioning properly when used directly. I’ve configured the WP Mail SMTP plugin with the settings provided by GoDaddy’s technical support, but emails still aren’t going through.

    Here’s what I’ve done so far:

    Ensured that my email settings in Google Workspaces are correct.
    Set up WP Mail SMTP with the credentials and server details as per GoDaddy’s guidelines used .
    Enabled less secure apps and set the app password for plugin.

    Yet, the issue persists (image If anyone has experience with this or any insights, I would greatly appreciate your assistance. I’m at my wit’s end trying to get this to work.

    Thank you in advance for your help!

    1. Hi Novak,

      Within this screenshot that you have provided, you need to click on the “View Full Error Log” button at the bottom of the screen to check your full error log.

      If you require further assistance, please submit a support thread on the WP Mail SMTP support forum along with your complete error log.

      I hope this helps. Thanks!

  3. Hi – we use the WP MAIL SMTP plug in on a couple of our sites. It’s sending fine on 2 of them but the third doesn’t seem to be sending the “processing” email to customers even though the set up is identical on all 3

    The processing email function is turned on in the settings – any ideas?

    Thanks in advance!

    1. Hi Ric,

      Are you able to send a test email (WP Mail SMTP -> Tools) from your 3rd website? If you encounter any issues when sending a test emails here’s a screenshot of the option to get a full error log. This will provide you with an idea of what might be going on. You can also check this guide on how to debug email sending issues.

      If you require further assistance, please open a support thread and provide detailed information. Our support staff will be able to assist you accordingly.

      I hope this helps. Thanks!

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