abylon CRYPTMAIL
Sending never again unencrypted emails. With abylon CRYPTMAIL offer abylonsoft a simple software for certificate based encrypting (PKCS-standard) of your secret data. With the AddIn for Outlook (not Outlook Express) you can pack or unpack so-called SME files (Secure Message Envelope = Signing... Additionally offer abylonsoft an user interface to create encrypted and signed emails. ... The SME-file is transmitted by the MAPI-interface to nearly every email program. ... The user must only send it to the recipient.
http://www.abylonsoft.de/download/SAOAID.exe - 6Mb - Download - Screenshot

abylon READER
The encrypting with the software of abylonsoft is not an one-way. The free READER-Version verify, decrypt and unpack SME files. At this time the following file extensions are supported (Symmetrical Encrypted: CR2 / Asymmetrical Encrypted: CRP, PK7, P7M, VSP7, ASC, TBE / Signed: P7M, VSP7, TBS,... The software offers also an integrated certificate manager, a module for creating of selfsigned certificates, the automatically saving of public keys and support numerous smartcards and USB-Token. ... The functions are offered simply by the right mouse button of the File Explorer.
http://www.abylonsoft.de/download/apmReadD.exe - 8Mb - Download - Screenshot