Duplicate of Ticket #7123.

We're using horde groupware webmail edition version 1.1.
I will try with latest version.
I'll keep you updated.

What exact IMP version are you using? We already tweaked a bunch of 
settings in this regard. Also, did you upgrade, or install from 
scratch? If you upgraded, make absolutely sure that you updated IMP's 
prefs.php file.

I could try to provide a patch to solve the problem but I would like 
to know what solution would be accepted.

For me, either use_trash must not be disabled when trash_folder is None.
or the None option should not be allowed for the trash_folder (if the 
user whant to disable the trash folder it has to be done ith the 
use_trash option in the "Deleting and Moving Messages" options group).

I would prefer this second option.


(it's also a bit strange to be able to select None for the draft 
folder as the "Save Draft"  button is always active in the compose 
window and so triggers an error message if draft_folder is None)

If a user select None as the trash folder, this will automatically 
disables the trash usage.
As a result, the trash folder selection widget disappears.

Normally you would have to go to the "Deleting and Moving Messages" 
options group and reenable by clicking on the "When deleting messages, 
move them to your Trash folder instead of marking them as deleted?" 
option. That would bring back the trash folder selection widget.

However that doesn't work because each time you enable and save the 
use_trash option, imp automatically disables it because the 
trash_folder is "None".

So the user needs to change the trash folder to enable use_trash, but 
he needs to enable use_trash to be able to change the trash folder...