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The Signature application is unable to process e-mails that are signed (a digital signature appended based on the contents of the e-mail to enable the recipient to tell if the email has been modified) or sealed/encrypted (contents of the e-mail are encrypted).
The application checks for e-mails that are signed or encrypted, if so the application allows the e-mails to pass without adding a signature.
Signed e-mails contain a field "$Signature"
Encrypted emails contain a field "$Seal"