http://sylpheed.sraoss.jp/en/download.html
<- Link to Sylpheed homepage.

file for ui of ' configuration-> edit_acocount-> edit -> Basic/rec/send ' ..
is something like pref_accounts.c;

( did lots of hit &try on this to get all the feilds in one screen, just for login thing. )

there are a few menus ( like common prefrences ) which are overflowing the screen, i think they can be done with GtkScrollWindow, I was unable to put it to use bcz of lack of knowledge..