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This document will attempt to record all root causes I've seen for a "body of message has been altered" or "message has been altered" DKIM verification result. 1. Incorrect use of Mail::DKIM's PRINT() method. The implementer fed the message in as it was received over SMTP, without reversing the "dot-stuffing". So if the message contained any lines beginning with a period, the message would be signed or verified incorrectly.