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Old 3rd May 2009, 17:40
topdog topdog is offline
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That indicates that something is modifying the email after signing has already taken place. If you sign mails with simple canonizations any modifications lead to failure in verification relaxed canonizations are more tolerant to modifications after signing.

If you got the time take a look at the DKIM RFC available at http://www.ietf.org/rfc/rfc4871.txt
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