How to convert message received on postfix filter to javamail mutipart message

[Arora, Sumit]

I'm using SMTP content filter in my postfix smtp server, I'm receiving raw 
message on my
SMTP filter like:
Mail From, RCPT TO, DATA

Now I need to convert this message into javamail multipart message.

Is there any good way to convert into it.

Thanks,
Sumit Arora