Introducing the Postmark mailer for WP Mail SMTP

Introducing WP Mail SMTP 3.1 – Postmark Mailer Is Here

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Today we’re celebrating the release of WP Mail SMTP 3.1.

And with it, we’re thrilled to welcome Postmark – our brand new mailer!

Postmark homepage

We’re super excited about welcoming Postmark to our family of email providers. Now you can benefit from its reliable and speedy email delivery service in WordPress.

(And the delivery speeds we’ve seen in testing are seriously impressive.)

So if you’re running an online store, or you have a busy membership site, this could be the email provider you’ve been waiting for.

Let’s take a closer look.

Fast Email Delivery From WordPress

We know that email is vital for the success of your website. Helping you receive messages reliably and quickly is our #1 goal.

So when we saw Postmark’s promise of immediate email delivery, we just knew we had to try it for ourselves.

And wow… it sure is fast!

Here’s an example of real Time to Inbox data from Postmark:

Postmark Time to Inbox statistics

That’s the real delivery time for Gmail, Yahoo, and other top providers at the time we snapped the picture. (You can check the real-time delivery statistics right now on the Postmark status page.)

Both our Lite and Pro customers can benefit from these awesome speeds in the new release of WP Mail SMTP.

Perfect For Transactional Email

Instant email delivery is particularly important for transactional emails.

Transactional emails are the most urgent, time-sensitive notifications that your WordPress site sends, like:

  • WooCommerce order emails
  • Password reset emails
  • New user account emails
  • Double optin confirmations

Your customers expect transactional emails to arrive in seconds. And that’s Postmark’s promise too. So what’s its secret weapon?

It keeps bulk emails completely separate from transactional emails.

That means it’s able to optimize its infrastructure for lightning-fast speeds.

The Postmark API is secure and GDPR-friendly. In fact, using an API is more secure and reliable than using a regular SMTP server to send WordPress emails.

On top of that, Postmark says its entire business is based on “never losing a single email”. If you’ve been struggling with contact form notifications that seem to vanish, that’ll be music to your ears.

How to Use Postmark + WP Mail SMTP

If you’re a Lite or Pro customer, you now have access to our brand new Postmark mailer in WP Mail SMTP 3.1.

After updating the plugin to the latest version, head to WP Mail SMTP » Settings and hit Launch Setup Wizard.

Launch Setup Wizard button

Start the Setup Wizard and then select the new Postmark mailer right here:

Postmark mailer in WP Mail SMTP Setup Wizard

That’s it… the Setup Wizard will guide you through the rest!

Postmark will give you 100 free emails each month. From there, pricing for Postmark’s transactional email service starts at $10 a month, so it’s super accessible for any kind of business.

We can’t wait for you to try it out!

Get WP Mail SMTP 3.1 Now

We Want Your Feedback

We’d love to know about the features you’d like to see in the next release of WP Mail SMTP. And if you have any suggestions for new mailers, be sure to comment and let us know about those too.

From the whole team here at WP Mail SMTP, thanks for your ongoing support!

Jared Atchison


  1. Thanks for making it real.

    100 emails is Good, but if you double it on special occasions ie. black Friday.. our Birthday… that would be perfect!

    1. Hi Chris,

      We’re happy to have made the Postmark mailer a reality in WP Mail SMTP!

      WP Mail SMTP itself does not set any limitations on the number of emails sent out of your WordPress site. The limitations are set by the mailers themselves. You can always check with Postmark to see if they have any discounts or special deals available.

      Thanks! 🙂

  2. This is very cool. I’m presently using So, a. Is it safe to presume that I can only use one or the other? And, b. If so, would you recommend Postmark over Thanks.

    1. Hi Bill,

      Yes, you are correct that you can only choose one mailer. This is because if you had two, every email sent out would send twice, one from each mailer. is one of our recommended mailers. We recommend it because of its track record for reliability. However, it is totally up to the user which mailer is right for their situation.

      You can compare your mailer by reading through our complete guide to mailers (but please note, the Postmark mailer is not yet added to this article).

      I hope this helps!

      Thanks! 🙂

  3. Postmark signup does not accept email address on public domains – Gmail, Outlook, Yahoo etc. Must be private domain. Even if you worked for company with this most ban private use of company email addresses these days but frankly 99% people I know only have a public domain email address so this policy seems short sighted?

    1. Hi Warren,

      Thank you for sharing those details! You are correct that Postmark does not allow sending from any public domain email addresses. While we don’t personally have control over this within our WP Mail SMTP plugin, we do offer other mailers available for users if needed.

      In case it helps, you can check out our complete guide to mailers.

      Thanks! 🙂

  4. I am wondering if any change has been made in the “WP Mail SMTP” lite plugin since Sept 30 2021 that might interfere with server certificate validation. I started to encounter problems on that date. The server administrator says the certificate is up to date, and that other email sending mechanisms are working fine with their servers. See thread Thanks!

    1. Hi Sheila,

      Our support team has responded to your forum thread.

      Basically, the WP Mail SMTP plugin is just an integration service and we don’t change or control your server configurations such as SSL certificates.

      If you’re using Let’s Encrypt SSL, please follow the suggestion on that thread.


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