S/MIME signature/encryption handling for Claws Mail

 This plugin handles S/MIME signed and/or encrypted mails in Claws Mail.
 You can decrypt mails, verify signatures or sign and encrypt your own mails.
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 S/MIME is also known as PKCS#7 and uses the application/pkcs7-signature
 or application/x-pkcs7-signature MIME subtype within messages.
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 Receiving an attachment called smime.p7m is also sign of this kind of
 signature usage.