News•Feb 24, 2026
Designing HTML Email Templates for Transactional Emails
Transactional email templates are automated, action‑triggered messages that convey essential information such as order confirmations, password resets, or alerts. Designing these HTML templates is notoriously complex due to diverse client rendering engines, limited CSS support, and the need for mobile‑responsive layouts. The article outlines concrete best practices—standard 800 px width, single‑column design, inline CSS, accessibility checks, and authentication protocols—to ensure deliverability and brand consistency. Mailgun provides open‑source, responsive templates with dark‑mode support and tools like Mailgun Inspect to streamline testing and personalization.
