MIME is the standard that allows emails to include attachments, HTML, and multiple content types. Learn why MIME matters for rendering and compatibility.
MIME (Multipurpose Internet Mail Extensions) is a standard that lets email include more than plain text, such as HTML, attachments, and inline images. MIME defines how content types are labeled and structured so clients can interpret them correctly.
MIME is why an email can contain both an HTML version and a plain-text version, or multiple attachments with different file types. It also influences how email clients render content and how filters scan messages.
Correct MIME structure improves compatibility across inboxes and reduces weird display issues. For high-quality sending, ensure your messages include a clean plain-text alternative and avoid broken multipart boundaries.