SMIME question!!!Help!

[Maya]

Hello!   I need to create SMIME functions - sign, encrypt, verify, decrypt. I am using as an example smime command tool.   When I sign a message, the signer's certificate is included in the resulting smime message. Then later when I try to verify this Smime message, I am asked to specify CA file.   My question is:  Is it possible to include CA certificate when I sign and to be asked about it in verifying but directly to get it from SMIME message itself???   (I don't want to use option -noverify, because in this case the signature of signer's certificate is not verified).   Thanks !!! Maya