[Djigzo users] UUEncode and S/Mime

Good morning, I recently faced the problem that Emails that were sent uuencoded and encrypted (as far as I know sent by Outlook 2010 via Exchange 2013) did not get decrypted by ciphermail. The Mail was uudecoded, but the resulting attachment named smime.p7m (probably the S/Mime Signature) and smime.eml (probably the encrypted message) was not validated/decrypted. Is there anything that can be configured to solve that problem ? Thank you Christian