https://mailchimp.com/developer/transactional/api/urls/add-tracking-domains/
Add tracking domains | Mailchimp Transactional API Reference | Mailchimp Developer
Add a tracking domain to your account.
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https://www.mailgun.com/blog/email/responsive-email-templates-you-can-get-creative-with/
Responsive Email Templates you can get creative with - Transactional Email API Service For...
Feb 23, 2026 - This latest addition allows you to add, edit, and store your email templates within Mailgun without having to dig around.
responsive email templatesyou canget creativetransactional apiservice