How to Set Up WordPress SMTP With Postmark (Easily)

Are you not receiving email notifications from your WordPress contact forms? If you’re looking for an easy and reliable method to ensure email deliverability, using the Postmark plugin to set up Simple Mail Transfer Protocol (SMTP) on your site is the best bet. In this post, we’ll show you how to set up WordPress SMTP with Postmark.

Reasons for Not Receiving Notifications

WordPress uses the PHP mail function to send emails that are generated by a contact form plugin like WPForms. Many hosting servers (unmanaged or managed WordPress hosting) are not configured to use the PHP mail function.

That means that your WordPress emails, including the WPForms notifications, won’t even make into the spam folder.

That’s why we recommend using SMTP to send emails from WordPress instead of using the default PHP mail function. SMTP (Simple Mail Transfer Protocol) is an industry standard way to send emails that use proper authentication method to ensure email deliverability.

Why Postmark

Oftentimes, setting up a reliable WordPress SMTP on your site requires you to go through a lot of steps. If you’re looking for a simple yet reliable SMTP method to ensure email deliverability, Postmark is the right plugin for you.

Note: Postmark doesn’t allow you to use public domain emails such as Gmail and Yahoo. You can only use an email address from the domains you own (such as To use a free email address such as Gmail or Yahoo, see our tutorial on how to set up the WP Mail SMTP plugin.

WPForms is the best WordPress Form Builder plugin. Get it for free!

Creating a Postmark Account

Sign up for Postmark by clicking on this link. Create your new login credentials and click Let’s get started.

postmark new account

To continue setting up SMTP with Postmark, you can start with a free Postmark trial account.

Now you’ll be directed to a welcome page. Click Get started » Sounds good, and then, enter any name you wish to create your first server.

create first server

Let’s name it mywebsite.

Now you’ll be prompted to enter your Full Name and From Email (such as [email protected]). After entering the details, click Create sender signature.

create a sender signature

You’ll now be sent a verification email. Confirm the sender signature by clicking the Confirm this Sender Signature button.

confirm sender signature

After clicking the button, you’ll see a success message in a new tab. See the screenshot below to make sure you’re on track with setting up SMTP with Postmark.

postmark sender signature activated

Configuring the Postmark Plugin

Now install the Postmark plugin and activate it on your site.

Now you’ll need to configure the Postmark plugin.

To do this, go to your Postmark server page by clicking on this link. Then, click on the server you just created.

click servers

To view Server API, click the Credentials tab. Now copy the Server API Key tokens.

add credentials

In your WordPress dashboard, navigate to Settings » Postmark. Then, click the checkbox next to Enabled? to enable sending emails using Postmark SMTP. Then, insert the API Key you copied from the Postmark site. In the Sender Email field, be sure to add the verified sender signature email.

postmark general settings

Note: In WPForms, the same email should be used in the Send From setting in your form notifications.

You can leave the remaining checkboxes unchecked. Then, select Save Changes.

Now click the Send Test Email tab and enter your test email. You can uncheck the box, Send test as HTML, with Open Tracking enabled and click Send Test Email to send a test email.

send test email wordpress smtp postmark

You’ll see something like this.

test email verified

Final Thoughts on SMTP With Postmark

That’s it! You’ve now successfully sent a test email and configured WordPress SMTP with Postmark on your site.

There are lots of different ways to configure SMTP on your WordPress site to get the form notifications. You can also take a look at how to configure the mailer on your site.

What are you waiting for? Get started with the most powerful WordPress forms plugin today.

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  1. I want to use postmark plugin in newsletter subscriber plugin. How can I use it ?? Please reply ASAP

    1. Hi Kara!
      Thanks for letting us know. I have forwarded this to the post author in order to make the appropriate edits if needed.

      Have a good one 🙂

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