What are the technical standards for HTML emails (MIME compliance)?
Technical standards for HTML emails center on MIME compliance defined in various RFCs. Messages should use proper Content-Type headers, appropriate character encoding (UTF-8 preferred), and valid multipart structures for mixed content.
HTML should be well formed and reasonably standard. Email clients have varied rendering capabilities, so avoiding cutting edge CSS and JavaScript (which is stripped) improves compatibility. Tables for layout remain more reliable than modern CSS techniques.
Include both HTML and plain text versions in multipart/alternative format. This ensures recipients with text only clients or accessibility needs can read your content. The text version should meaningfully convey the message, not just be a minimal placeholder.
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