[jira] [Created] (JAMES-3753) Bug in FlowedMessageUtils.deflow() can lead to quote characters being stripped

["cketti (Jira)" <se...@james.apache.org>]

cketti created JAMES-3753:
-----------------------------

             Summary: Bug in FlowedMessageUtils.deflow() can lead to quote characters being stripped
                 Key: JAMES-3753
                 URL: https://issues.apache.org/jira/browse/JAMES-3753
             Project: James Server
          Issue Type: Bug
            Reporter: cketti


When a quoted line ends with a space and is followed by an empty line (quote depth 0), the text isn't decoded properly.

Example (the text "Quoted" is followed by a space, indicating a flowed line):
{noformat}
> Quoted 

Text
{noformat}

will be deflowed to

{noformat}
Quoted
Text
{noformat}

[RFC 3676|https://datatracker.ietf.org/doc/html/rfc3676] specifically mentions this case:
{quote}A generating agent MUST NOT create this situation; a receiving agent SHOULD handle it by giving preference to the quote depth.
{quote}

However, an email containing such data was encountered in the wild. See [https://github.com/k9mail/k-9/issues/6029].



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