Should MimeException extent IOException
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                 Key: MIME4J-76
                 URL: https://issues.apache.org/jira/browse/MIME4J-76
             Project: JAMES Mime4j
          Issue Type: Bug
    Affects Versions: 0.4
            Reporter: Markus Wiederkehr
             Fix For: 0.5


The constructor of Message(InputStream) uses its inner class MessageBuilder to 
parse the input stream and create the object. The method 
MessageBuilder.field(String) calls Field.parse(String) to parse header fields. 
This method throws an IllegalArgumentException on parse errors.

Clearly the Message constructor should throw a MimeException instead of an 
IllegalArgumentException if an invalid header field is encountered (or else it 
should simply ignore the field). So either Field.parse(String) should throw a 
MimeException or MessageBuilder.field(String) should catch and convert it.

And by the way, could you make MessageBuilder public so it can be extended if a 
slightly different behavior is desired.

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