To decrypt signed and encrypted messages 
openssl smime -in MailEncrypted.txt -decrypt  -recip recipient.crt \
-inkey recipient.key > MailDecrypted.txt

To verify signature
openssl smime -in MailDecrypted.txt  -verify -out Mail.txt \
-signer sender.crt -CAfile ca.crt 

Password on all certificates: 123456

###################################################################

If you gonna to run your own CA and/or create your own certificates 
here is some help. DONT ASK ME ANY SINGLE STUPID QUESTION please. 10x.
DONT ASK ME ANY BUNCH OF STUPID QUESTIONS EITHER. Thanks.

1. Run CA.pl -newca   it will create directory structure
Look at misc directory which comes with openssl

2. You may hack defaults in openssl config file, or create your own
config file. If so run export OPENSSL_CONFIG=`pwd`/openssl.cnf to 
force openssl to use YOUR config

3. ROOT CA KEY 4096 bits long
openssl genrsa -des3 -out ca.key 4096 

4. ROOT Self signed certificate for 4 years
openssl req -new -x509 -days 1460 -key ca.key -out ca.crt

5. Key for user 4096 keys long
openssl genrsa -des3 -out user.key 4096

6. Certificate signing request for user for 4 years
openssl req -new -days 1460 -key user.key -out user.csr

7. Sign it with ROOT CA CERT
openssl ca -in user.csr -out user.crt -cert ca.crt -keyfile ca.key -days 1460

8. To load into Outlook or Mozilla you will need PKCS12 file format.
NOTE !!!!! NOTE !!!!!
**** This format joins private key and certificate leaving private key unprotected.
**** Make sure you provide export password and don't send this file
**** via open link if you are really paranoid
****
openssl pkcs12 -export -in user.crt -out user.p12 -inkey user.key -name "Dear User Personal Certificate" 


9. To sign message

openssl smime -sign -in /etc/passwd -signer user.crt -text -inkey user.key > signed.txt

10. To encrypt

openssl smime -encrypt -out encrypted.txt -from user@test.com -to user@test.com -subject "puzzle" -des3 user.crt

11. Hope that helps to prevent III World War and to improve your brain ability.
So finally it makes our life on this planet more peacefull and enjoyable.

Dmitry Dorofeev.
dima@yasp.com