HTML design for email is a trickier prospect than HTML for the Web. Your message must display correctly across dozens of clients and platforms, each with its own quirks and rendering issues.

Good HTML creates branded, usable and attractive email messages that convert better overall than plain text. But when HTML goes bad, your messages will be unreadable, not function correctly or trigger email blocks or filters.

This list of 20 best practices addresses critical issues in coding and design in three key areas: format, functionality and usability. These issues affect rendering (how recipients view your message in their email clients) and deliverability (how likely your messages will be blocked or filtered as spam because of incorrect or suspect coding).

It's not a comprehensive manual of HTML and newsletter design. However, it pinpoints common problems HTML in email presents and offers alternatives and suggestions.

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