This issue affects messages with RFC 2047 encoded Subject: and/or Keywords: headers as well as messages with encoded bodies containing Subject: and/or Keywords: pseudo-headers. The patch at comment #1 is incomplete as it doesn't take into account pseudo-headers and only decodes the first encoded word in an RFC 2047 encoded header.
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This issue affects messages with RFC 2047 encoded Subject: and/or Keywords: headers as well as messages with encoded bodies containing Subject: and/or Keywords: pseudo-headers. The patch at comment #1 is incomplete as it doesn't take into account pseudo-headers and only decodes the first encoded word in an RFC 2047 encoded header.