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python Programming Glossary: rfc2047how to tell if a string is base64 or not http://stackoverflow.com/questions/271657/how-to-tell-if-a-string-is-base64-or-not to the headers. gb2312 B uLGxvmhlbrixsb5nLnhscw That's an RFC2047 encoded header atom. The stdlib function to decode it is email.header.decode_header.. This is simply wrong. What mailer created it RFC2047 encoding can only happen in atoms and a quoted string is not.. only happen in atoms and a quoted string is not an atom. RFC2047 §5 explicitly denies this An 'encoded word' MUST NOT appear..
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