Gmail by Google is a great email delivery provider and you can use it to send all your newsletter campaigns with Mailster.

Since Gmail is not really built for sending marketing emails you have to consider a couple of things:

  • Google is very restrictive with its service and if your subscribers starting mark your emails as spam you most likely get banned from the platform.
  • With a free Gmail account you have more limits as with a paid G Suite account (Read more about limits).
  • You should only send from your Gmail address (free users) or from your registered G Suite addresses.

You can always choose one of the other email service provider Mailster can work with.

Get the free Gmail Integration plugin for Mailster

You can download the add on on the WordPress repo or find it within the plugins section of your site. Once you’ve activate it head over to Newsletter => Settings => Delivery and select the “Gmail” tab.

Gmail Integration Settings Screen

Create a Web App in your Google account.

Before we continue in Mailster you have to create a new web app which you can do on the Googles APIs registration page.

After you have followed the link and logged in to your Google account you have to Create a project for Mailster. You can use an existing project but we recommend to create a new one.

Create a new project in Google APIs Dashboard

Once you finish this step Google will tell you that the “API is enabled”. You now have to answer three questions:

  • Which API are you using? 
    • Gmail API
  • Where will you be calling the API from?
    • Web server (e.g. node.js, Tomcat)
  • What data will you be accessing?
    • User data

Than click on What credentials do I need? to continue which opens a modal box with Set Up OAuth consent screen where you click on Set Up Consent Screen link.

Set up OAuth content screen modal

You now have to select which type of content screen you would like to use.

Internal: Only users from the same organisation can request access to your app.

External: Every user with a Google Account can access your app.

For @gmail.com users (free) only the “External” option is available so choose this one.

Google doesn’t have to verify your application if you choose External as Mailster should be the only app which you give access to this application. More on that later.

Users with an @gmail.com only can choose the External option.

Click on Create to define the name of your Application.

Application setup screen.

Give you app a reasonable name so you can remember it later. You can use “Mailster Gmail Integration for yourwebsite.com” for instance. You can optionally define a logo as well.

Below your Application name you have to enter the Authorized Domain which is yourdomain.com (without www).

For Application Homepage link, Application Homepage Policy link and Application Terms of Service link just insert your homepage URL as the consent screen will only be seen by yourself.

Authorized domains and Application specific links.

When you are finished click on the save button (You do not have to submit the app for verification).

Create an OAuth Client ID

You will come back to the dashboard where you have to create an OAuth client ID.

Create Credentials for your app.

On the Add credentials to your project screens can define a custom Name or keep it as it is.

For Authorized JavaScript origins, you have to enter the URL of your site.

For the Authorized redirect URIs you need the address from the settings page of the Gmail add on in Newsletter => Settings => Delivery

Create new credentials for your app.

When you have entered the information click on the “Refresh” button at the bottom. If everything is correct you will now be able to Create OAuth client ID.

Great, you have now your own Google web application!

Get Client ID and Client Secret

You now need to get your Client ID and Client Secret.

Copy and paste these detail into you the two fields on the delivery settings page:

Bring your Client ID and Secret into the add on.

Once you save the settings Mailster will offer an “Authorize” button you have to click which will redirect you to the Google Accounts page where you have to login and Allow the access.

This app isn’t verified

If you use a free Gmail account and choose “External” on the OAuth consent Screen Google shows a warning before you can allow your choices. You can safely ignore this warning and click on “Go to yoursite.com (unsafe)” (Click on Advanced).

Once you are back in your Newsletter Settings the “Authorize” button should have vanished and you’re ready to go.

Click on the Send Test button to quickly check if this works.

Bounce Handling

The addon is able to handle bounces without further actions. It will only handle bounces from mails which were sent with this addon.

If you have problems feel free to open a ticket and we’re happy to help.

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