Disable access to extdata from user sieve scripts

dovecot/conf/dovecot.conf

@@ -152,7 +152,7 @@ service managesieve {
 plugin {
 	sieve = file:~/sieve;active=~/.dovecot.sieve
   sieve_plugins = sieve_extdata
-  sieve_extensions = +vnd.dovecot.extdata +spamtest +spamtestplus
+  sieve_global_extensions = +vnd.dovecot.extdata +spamtest +spamtestplus
 	sieve_before = /var/lib/dovecot/before.sieve
 	sieve_default = /var/lib/dovecot/default.sieve
 	sieve_after = /var/lib/dovecot/after.sieve