How to Set Up the Outlook Mailer in WP Mail SMTP

Want to use your Outlook account to improve email deliverability for your WordPress site? The Outlook mailer for WP Mail SMTP lets you securely use Microsoft’s API to authenticate your site’s emails.

In this tutorial, we’ll show you every step needed to set up the Microsoft Outlook mailer in WP Mail SMTP.

  1. Getting Started with WP Mail SMTP
  2. Configuring a Microsoft Azure Account
  3. Saving Settings and Authorizing WP Mail SMTP
  4. Sending a Test Email

1. Getting Started with WP Mail SMTP

To get started, you’ll need to install and activate the WP Mail SMTP plugin.

Once you’ve installed and activated the plugin, go to WP Mail SMTP » Settings. At the top of the Settings page, you’ll see a From Email and From Name options. You can skip both of these settings, as anything here will be overridden by the settings within your Outlook account (later on, you’ll notice that these fields both end up disabled).

From Email and From Name in WP Mail SMTP

We recommend checking the optional Return Path checkbox to Set the return-path to match the From Email. With this enabled, you’ll be emailed if any messages bounce as a result of issues with the recipient’s email.

Set return path to match From Email

Next, you’ll need to scroll to the Mailer field and select the Outlook option.

Select Outlook mailer in WP Mail SMTP

Now that you’ve chosen the Outlook mailer, you should see a new section appear titled Outlook.

To generate the information needed for this section, you’ll need to set up a web application within a Microsoft Azure account. This process doesn’t require any coding, and we’ll show you exactly what to do in the next step.

Be sure to keep these WP Mail SMTP settings open in a separate tab or window, as you’ll come back to them soon.

2. Configuring a Microsoft Azure Account

In order to move forward with the setup process, you’ll need to have a Microsoft Azure account.

Since you most likely already have a Microsoft email account (through Hotmail, Live, Outlook, Office 365, etc), you can simply log into Microsoft Azure with your existing account credentials.

Note: Be sure that the email used for your Microsoft Azure account is the same email address you’d like to use as the From Email on your website.

If you need to create a brand new account, you can click this link sign up for a free Microsoft Azure account.

Note: While your account is free and this mailer setup does not require use of any paid services, Microsoft will require that you enter a credit card to set up an account to reduce spam signups.

Also, be sure to check that the account you use for signup includes email sending permissions.

After you’ve decided on the email, you’ll need to open the Azure Portal.

Create an Application ID

Once the Azure Portal is open, click on All services in the left sidebar.

Click on All Services option in Microsoft account

Next, you’ll see a list of categories. Go ahead and click on Identity. When an additional column appears, click on App registrations.

Select Identity and then App Registrations

At the top of the App Registrations page, you’ll need to select the + New Registration option.

Click on New Registration

In the app registration form, here are the details you’ll need to fill out:

  • Name: This is only for your personal organization, so we recommend naming it something like “WP Mail SMTP: yourdomain.com”.
  • Supported Account Types: Select Accounts in any organizational directory and personal Microsoft accounts.

Example of app registration form in Microsoft

  • Redirect URI: For the first dropdown, leave this set to Web. Then for the second field, you’ll need to copy this value from your WP Mail SMTP settings (see below).

In order to find the Redirect URI, you’ll need to flip back to the tab or window where you left your site’s WP Mail SMTP settings open. Under the Outlook section, you’ll see a field named Redirect URI.

Copy Redirect URI from WP Mail SMTP settings

You’ll need to copy this value, then paste it into your Microsoft Azure app registration form. Be sure to still keep both windows/tabs open in your browser, as we’ll continue to switch between the two.

Finish app registration form in Microsoft

When you’re ready, click the Register button to proceed.

As soon as this registration form is submitted, you should see a page that includes Application (client) ID.

Copy Application ID from Microsoft

You’ll need to copy this full value into your WP Mail SMTP settings, in the field labeled Application ID.

Paste Application ID into WP Mail SMTP settings

Create an Application Password

Next, we’ll need to generate a password for this app. To do that, click on Certificates & secrets in the white sidebar.

Open Certificates and Secrets menu item

On this screen, skip down to the Client Secrets section. Then select + New client secret.

Create a new client secret in Microsoft settings

An overlay will appear, and here you’ll need to fill out a short form:

  • Description: This name is only for your own use, so we recommend a logical and simple name such as app_password.
  • Expires: Never

Example form to add a client secret in Microsoft

After you submit the client secret form, the Application Password will be generated.

Copy client secret from Microsoft account

You’ll need to copy this into your WP Mail SMTP settings. Once you’ve returned to the tab or window where these settings are still open, paste this value into the Application Password field.

Paste client secret into Application Password field in WP Mail SMTP

Set Up API Permissions

Now that you’ve got both the Application ID and Application password filled out in WP Mail SMTP, the next step is to set up API permissions. To get started, you’ll need to click on API permissions in the white left menu.

Then, click on the + Add a permission option.

Add a permission to your Microsoft API

This will open a page titled Request API Permissions. Here, you’ll need to click the large top option named Microsoft Graph.

Click on the Microsoft Graph option

You’ll only need to fill out a couple pieces of information on this page:

  • What type of permissions does your API require: Choose the option named Delegated permissions

Choose delegated permissions for Microsoft API

  • Select permissions: Type in send. Then, from the options that appear, check Mail.Send.Shared.

Provide mail sending permissions

When you’re ready, click the Add permissions button to proceed.

Next, you’ll need to go through this permissions process once more in a slightly different way. To do this, go ahead and again click on + Add a permission, followed by the Microsoft Graph option.

Here are the new details you’ll need for this additional set of permissions:

  • What type of permissions does your API require: Choose the option named Application permissions.
    • Add application permissions in Microsoft

  • Select permissions: Type in send. Then, from the options that appear, check Mail.Send.

Add mail sending permissions to app

Once again, click the Add permissions button when you’re ready to proceed.

Now your API permissions are all set in Microsoft’s system, and we can finish up the configuration in WP Mail SMTP.

3. Saving Settings and Authorizing WP Mail SMTP

Back in the WP Mail SMTP settings, you should now have all fields filled out. After checking this over, you can click Save Settings at the bottom of the page.

Save WP Mail SMTP settings

After you’ve saved, you’ll need to scroll down to the Authorization setting. You should now see a button labeled Allow plugin to send emails using your Microsoft account.

Provide authorization for Microsoft account

As soon as you click this button, you should be redirected to a Microsoft permissions form.

Microsoft permissions request form

At the bottom of this form, click Yes.

Next, you will be redirected back to your WP Mail SMTP settings. At the top of these settings, you should see a notice letting you know that you’ve successfully connected your Microsoft account.

Microsoft API has been successfully connected

4. Sending a Test Email

Now that your Microsoft API is set up and connected, it’s important to send a test email to ensure that everything is working properly. To do this, make sure you’re on the Settings » WP Mail SMTP page and then open the Email Test tab.

Send a test email in WP Mail SMTP

On this tab, you can enter any email address that you have access to (the default will be the site’s admin email). Then, click the Send Email button.

After sending the email, you should see a success message.

WP Mail SMTP test email was sent successfully

If you check the inbox for that email address, you should receive the email for this test.

Test email for WP Mail SMTP Gmail

That’s it! You have successfully set up your site to send WordPress emails with the Outlook mailer in WP Mail SMTP.