Name: autocreate_sieve_folders
Type: STRING
Default-Value: NULL
Last-Modified: 2.5.0

A "|" separated list of subfolders of INBOX that will be automatically
created, if requested by a sieve filter, through the "fileinto" action. The
default is to create no folders automatically.

Leading and trailing whitespace is stripped from each folder, so a setting
of "Junk | Trash" will create two folders: "Junk" and "Trash".
