How do I send an HTML email?

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As per the Javadoc, the MimeMessage#setText() sets a default mime type of text/plain, while you need text/html. Rather use MimeMessage#setContent() instead.

message.setContent(someHtmlMessage, "text/html; charset=utf-8");

For additional details, see:

  • GMail Media Queries
  • GMail CSS Design
  • CSS support in mail clients

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