--- SoObjects/SOGo/SOGoSieveManager.m.orig	2021-11-18 21:53:17.000000000 +0100
+++ SoObjects/SOGo/SOGoSieveManager.m	2022-02-15 15:29:08.352000000 +0100
@@ -37,6 +37,7 @@
 #import <NGImap4/NGImap4Connection.h>
 #import <NGImap4/NGImap4Client.h>
 #import <NGImap4/NGSieveClient.h>
+#import <NGImap4/NSString+Imap4.h>
 #import <NGObjWeb/NSException+HTTP.h>
 
 #import "../Mailer/SOGoMailAccount.h"
@@ -529,8 +530,9 @@
               else if ([method isEqualToString: @"fileinto"])
                 {
                   mailbox
-                    = [[argument componentsSeparatedByString: @"/"]
-                          componentsJoinedByString: delimiter];
+                    = [[[argument componentsSeparatedByString: @"/"]
+                          componentsJoinedByString: delimiter]
+                          stringByDecodingImap4FolderName];
                   sieveAction = [NSString stringWithFormat: @"%@ %@",
                                           method, [mailbox asSieveQuotedString]];
                 }