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https://issues.apache.org/jira/browse/MIME4J-112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12671437#action_12671437
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Robert Burrell Donkin commented on MIME4J-112:
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Another difficulty for unlimited round tripping (without preserving the
original bits) is how to record the header wrapping for unconventional wrapping
schemes. For example, a message may choose to wrap header values early but this
information is lost during parsing.
> Define Limits Of Round Tripping In Mime4J
> -----------------------------------------
>
> Key: MIME4J-112
> URL: https://issues.apache.org/jira/browse/MIME4J-112
> Project: JAMES Mime4j
> Issue Type: Task
> Affects Versions: 0.6
> Reporter: Robert Burrell Donkin
> Fix For: 0.7
>
>
> By round tripping, I mean parsing some MIME document into a fully decomposed
> form and then recreating a new version of the document from this form.
> In theory, Mime4J decomposition and recomposition could be made perfect with
> no loss of information. In other words, given a MIME document, the parser
> could completely decompose the document and a bitwise identical copy could be
> recomposed.
> In practice, the limits of support are questionable. Some limitations may be
> expedient. For example, perhaps comments and encoding of ASCII characters are
> not sufficiently important to be worth preserving. Other limitations may
> arise from MIME documents which are not strictly compliant with the
> specification - for example, the use of unescaped non-ASCII characters in
> MIME headers may mean that the output would need to be escaped to ensure
> compliance.
> It is important to define and describe the limits of round tripping so that
> users and developers are clear about the level of support MIme4J claims. In
> addition, sufficient unit tests should be created to ensure in confidence
> that documents within these limits are correctly handled.
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