Mailgun is a mail delivery service that uses SMTP to send and track emails from a website or application. It includes an intelligent inbound routing system that tells you where every email you send will end up, providing the business more control over what is sent on its behalf.
To simplify Mailgun integration with your website, we created a Mailgun tag for the server Google Tag Manager container that enables you to send transactional emails using customer actions on your site.
     1. Mailgun tag on GitHub.
     2. Mailgun tag for server Google Tag Manager.
We created a Mailchimp tag for the Google Tag Manager server container to help you connect your site to Mailchimp. This tag allows you to utilize the Google Tag Manager server container to track events, create and update contacts or even do both simultaneously. The main benefit of using this tag is that you can add new users. Previously, it was only possible with the help of backend developers. It means that you can connect your site to Mailchimp using Google Tag Manager. No developers required.
Server-side tracking technology is a growing trend in website analytics. It allows for improved data analysis, faster website page loads, and more secure user information storage while maintaining accurate tracking. The most popular implementation of server-side tracking so far has been server Google Tag Manager (GTM). More and more vendors have started to support server-to-server tracking and released tags for sGTM. Using these tags, you can share website or app events and user data directly from your server GTM container to the vendor’s server.
How to integrate Mailgun with your site using server Google Tag Manager container.