+The minimum number of characters required to be typed in an autocomplete field before address books will be searched. Most useful for LDAP directories that may need to do lengthy results building given overly-broad searches
+If there's more than one address book, n parallel (async) requests will be created, where each request will search in one address book. By default (0), all address books are searched in one request.
+Attachments of these types will open in a preview window either a comma-separated list or an array: 'text/plain,text/html,text/xml,image/jpeg,image/gif,image/png,application/pdf'
+This key is used for encrypting purposes, like storing of imap password in the session. For historical reasons it's called DES_key, but it's used with any configured cipher_method (see below).
+Whether or not to encrypt the IP address and the host name.
+These could, in some circles, be considered as sensitive information; however, for the administrator, these could be invaluable help when tracking down issues.
+Absolute path to a local mime.types mapping table file.
+This is used to derive mime-types from the filename extension or vice versa.
+Such a file is usually part of the apache webserver. If you don't find a file named mime.types on your system, download it from http://svn.apache.org/repos/asf/httpd/httpd/trunk/docs/conf/mime.types
+- 'googie' - the default (also used for connecting to Nox Spell Server, see 'spellcheck_uri' setting)
+- 'pspell' - requires the PHP Pspell module and aspell installed
+- 'enchant' - requires the PHP Enchant module
+- 'atd' - install your own After the Deadline server or check with the people at http://www.afterthedeadline.com before using their API
+
+Since Google shut down their public spell checking service, the default settings connect to http://spell.roundcube.net which is a hosted service provided by Roundcube. You can connect to any other googie-compliant service by setting 'spellcheck_uri' accordingly.