[ALUG] What 'conversion' changes those = and =E9 in text to the proper characters?

I have some text which has lots of '= ' and '=E9' strings in it which should be just spaces and è. What would convert this text to properly readable text? Mutt seems to manage it OK (it's a mail message) but I want to do it myself to display it elsewhere and it doesn't seem to be just a simple iconv() conversion as what seems to be in the message are actual '=E9' strings not iso-8859-1 characters with more than 7 bits. Presumably it's encoded to fit in strict 7-bit ASCII but how do I unencode it? -- Chris Green