Content-Type: text/plain Content-Disposition: inline Content-Transfer-Encoding: binary MIME-Version: 1.0 X-Mailer: MIME-tools 5.411 (Entity 5.404) RT-Send-CC: X-RT-Original-Encoding: iso-8859-1 Content-Length: 229 The encoding was updated to align with the latest internet-draft for kerberos-clarifications, which specifies unsigned sequence numbers. The real problem is the re-encoding of the krb-safe message, which really shouldn't happen.