Email Template Design Best Practices for Higher Engagement

Email design is both art and science. You need templates that are visually appealing, technically sound, and optimised for engagement. The challenge? Email clients render HTML differently than browsers, mobile screens vary widely, and accessibility requirements add another layer of complexity. This guide covers everything you need to create email templates that work beautifully everywhere.

Mobile-First Design

Over 60% of emails are opened on mobile devices. Design for mobile first, then adapt for desktop—not the other way around.

Mobile Design Principles

Responsive Techniques

Use media queries to adjust layout for different screen sizes:

@media screen and (max-width: 600px) {
  .container { width: 100% !important; }
  .column { display: block !important; width: 100% !important; }
  .button { width: 100% !important; }
}

Image Optimization

Image Best Practices

Alt Text Best Practices

Alt text appears when images don't load. Write it thoughtfully:

• Descriptive: "Photo of volunteers serving meals at the community kitchen"
• Actionable for buttons: "Register Now button"
• Empty for decorative: alt="" for spacers and dividers

CTA Button Best Practices

Your call-to-action buttons are the most important element. They need to stand out and work everywhere.

Button Design Guidelines

Bulletproof Buttons

Use HTML/CSS buttons that work even when images are disabled:

<table border="0" cellpadding="0" cellspacing="0" role="presentation">
  <tr>
    <td style="border-radius: 4px; background: #f97316;">
      <a href="https://..." style="
        display: inline-block;
        padding: 14px 28px;
        color: #ffffff;
        text-decoration: none;
        font-weight: bold;
        font-size: 16px;
      ">Register Now</a>
    </td>
  </tr>
</table>

Accessibility in Email

Accessible emails work for everyone—including people using screen readers, those with visual impairments, and users with cognitive differences.

Semantic Structure

• Use proper heading hierarchy (h1, h2, h3)
• Use lists for list content
• Use tables only for tabular data, not layout
• Add role="presentation" to layout tables

Color and Contrast

• Minimum contrast ratio: 4.5:1 for normal text, 3:1 for large text
• Don't rely on color alone: Use icons or text to convey meaning
• Test for colour blindness: Use tools like Coblis simulator

Links and Buttons

• Make links visually distinct (underline or colour)
• Use descriptive link text ("Read our annual report" not "Click here")
• Ensure adequate spacing between clickable elements

Screen Reader Considerations

• Meaningful alt text for all functional images
• Empty alt (alt="") for decorative images
• lang attribute on html element
• Logical reading order in code

Dark Mode Considerations

Many email clients now support dark mode. Your emails should look good in both light and dark environments.

How Email Clients Handle Dark Mode

• No change: Some clients don't invert emails at all
• Partial invert: Some clients invert backgrounds but not images
• Full invert: Some clients invert everything including images
• Colour scheme aware: Some clients respect media queries

Design Strategies

@media (prefers-color-scheme: dark) {
  .body { background-color: #1a1a1a !important; }
  .content { background-color: #2d2d2d !important; }
  .text { color: #ffffff !important; }
}

Email Client Compatibility

Email clients render HTML very differently from browsers. What works in Chrome may break in Outlook.

Major Client Categories

Universal Techniques

• Use tables for layout: Yes, it's 1999, but tables work everywhere
• Inline styles: Some clients strip <style> tags
• Avoid CSS shorthand: padding: 10px 20px may not work everywhere
• Test in multiple clients: Litmus, Email on Acid, or manual testing

Outlook-Specific Fixes

Use MSO conditionals for Outlook-specific code:

<!--[if mso]>
  <table><tr><td width="600">
<![endif]-->
  <!-- Your content here -->
<!--[if mso]>
  </td></tr></table>
<![endif]-->

Typography Best Practices

Font Selection

• Web-safe fonts first: Arial, Georgia, Verdana, Times New Roman
• Web fonts with fallbacks: font-family: 'Open Sans', Arial, sans-serif;
• System fonts work everywhere: -apple-system, BlinkMacSystemFont, 'Segoe UI'

Text Formatting

Pre-Send Testing Checklist

Before sending any email, run through this checklist. For understanding how to measure success after sending, see our Email Marketing Metrics Guide.

Content Check

Design Check

Technical Check

Client Testing