The accounts configuration is stored in GConf under /apps/modest. What exactly are you looking for?
~ $ id uid=29999(user) gid=29999(users) ~ $ /usr/bin/maemo-summoner /usr/bin/modest.launch -s >/home/user/MyDocs/.documents/log 2>&1 ^Z[1] + Stopped /usr/bin/maemo-summoner /usr/bin/modest.launch -s 1>/home/user/MyDocs/.documents/log 2>&1 ~ $ bg [1] /usr/bin/maemo-summoner /usr/bin/modest.launch -s 1>/home/user/MyDocs/.documents/log 2>&1 ~ $ tail -f /home/user/MyDocs/.documents/log process 3632: arguments to dbus_bus_request_name() were incorrect, assertion "_dbus_check_is_valid_bus_name (name)" failed in file dbus-bus.c line 1070. This is normally a bug in some application using the D-Bus library.