* mail-config.c (error_dialog): helper function since we need to
set "modal" on the dialogs returned by gnome_error_dialog to make
them work when popped up from the modal Druid.
(service_acceptable): New function to check if the info entered on
a store/transport page actually checks out.
(mail_config_druid): Connect to the "next" signal on the store and
transport pages and don't let the user continue if the data is
bad and "check this before continuing" is checked. Also, only
display sources/transports in the "mail" domain. (Ie, not
"vfolder".)
svn path=/trunk/; revision=3255
0c991132ab
