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eml
Two EML files: eml_basic is a plain text email of 233 bytes, and eml_with_attachment is 564 bytes with a file attached. EML is a saved email message, and it has headers, a body and, where needed, MIME parts. The attachment version is the more useful test, since parsing nested MIME parts is where mail importers often go wrong. Check that your code reads the sender, recipient, subject and date, finds the attachment, and decodes it. Also test that an app which accepts .eml does not run or render anything dangerous from inside a message.