[Dovecot] I'm the beginner and I want some help

[Wei Da]

Hello,
I'm a software programmer and I work for a software corporation. We worked
on dovecot for a while. We want to add some new functions to dovecot. For
example, the mail stored on Mail-Server is plaintext, so we want to make it
encrypted. As the documentation was not too much, and read the source code
was too difficult for em. Would you give me some advice if I make this
specialty as a plugin?
Thank you!

WD David
from China.