MIME decoder
Multipart MIME messages have nested parts each with their own headers and encoding. This tool walks the tree and gives you a flat, scannable view.
Parsed structure will appear here.
FAQ
What encodings are supported?
Base64 and quoted-printable are decoded inline. 7bit and 8bit are passed through. Other encodings show as raw.
Does this handle nested multipart?
Yes — each multipart boundary is walked recursively. The depth indicator shows how nested each part is.
What about attachments?
Binary attachments display their length and content-type. Decoded bytes aren't rendered inline.
Is this useful for debugging deliverability?
Yes. Misformatted multipart, missing text/plain alternatives, and broken encoding are common causes of spam classification.