soundcard pactor program: mailbox mode planned

Hello friends
at the moment I maintain Tom Sailer's hf package, it is a linux soundcard FSK 
program that can transmit and rx pactor level 1, amtor, gtor, rtty.
I had the idea to add a pactor mailbox feature, like winlink or airmail which 
already exist. It might be interesting for clubs and hams who have a 
soundcard, but can not afford a ptc.
I do not want to invent the wheel again, and i am still not so deep in c. 
I think I am able to start with implement the command set, like usual in a 
mailbox. But I am looking for some tips, in what format to store the mails 
(mbox? maildir? is there an other special format in packet mailboxes?) and 
with which of the  existing programs I can connect my application (tnt?  tnn? 
dpbox? f6fbb?) to forward mails to packet and / or internet. Where can I 
begin to read?
Thanks for your ideas!
hf, last version 0.5, is at www.hfterm.sf.net
-- 
73 de
Günther
[email protected]
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