diff --git a/NEWS b/NEWS
index 621f5f3c3..723e367c0 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,16 @@
+4.1.1 (2019-XX-XX)
+------------------
+
+New features
+ -
+
+Enhancements
+ -
+
+Bug fixes
+ - [core] use the supplied Sieve creds to fetch the IMAP4 separator (#4846)
+
+
 4.1.0 (2019-10-24)
 ------------------
 
diff --git a/SoObjects/SOGo/SOGoSieveManager.h b/SoObjects/SOGo/SOGoSieveManager.h
index 574490de4..05b9a8fe7 100644
--- a/SoObjects/SOGo/SOGoSieveManager.h
+++ b/SoObjects/SOGo/SOGoSieveManager.h
@@ -1,6 +1,6 @@
 /* SOGoSieveManager.h - this file is part of SOGo
  *
- * Copyright (C) 2010-2014 Inverse inc.
+ * Copyright (C) 2010-2019 Inverse inc.
  *
  * Author: Inverse <info@inverse.ca>
  *
@@ -41,7 +41,8 @@
 + (id) sieveManagerForUser: (SOGoUser *) user;
 - (id) initForUser: (SOGoUser *) newUser;
 
-- (NSString *) sieveScriptWithRequirements: (NSMutableArray *) newRequirements;
+- (NSString *) sieveScriptWithRequirements: (NSMutableArray *) newRequirements
+                                 delimiter: (NSString *) delimiter;
 - (NSString *) lastScriptError;
 
 - (NGSieveClient *) clientForAccount: (SOGoMailAccount *) theAccount;
diff --git a/SoObjects/SOGo/SOGoSieveManager.m b/SoObjects/SOGo/SOGoSieveManager.m
index 799a49dda..d7de49c20 100644
--- a/SoObjects/SOGo/SOGoSieveManager.m
+++ b/SoObjects/SOGo/SOGoSieveManager.m
@@ -32,6 +32,8 @@
 #import <SOGo/SOGoTextTemplateFile.h>
 
 #import <NGExtensions/NSObject+Logs.h>
+#import <NGImap4/NGImap4Connection.h>
+#import <NGImap4/NGImap4Client.h>
 #import <NGImap4/NGSieveClient.h>
 
 #import "../Mailer/SOGoMailAccount.h"
@@ -450,7 +452,6 @@ static NSString *sieveScriptName = @"sogo";
 {
   NSString *sieveAction, *method, *requirement, *argument, *flag, *mailbox;
   NSDictionary *mailLabels;
-  SOGoDomainDefaults *dd;
 
   sieveAction = nil;
 
@@ -486,7 +487,6 @@ static NSString *sieveScriptName = @"sogo";
                 }
               else if ([method isEqualToString: @"fileinto"])
                 {
-                  dd = [user domainDefaults];
                   mailbox
                     = [[argument componentsSeparatedByString: @"/"]
                           componentsJoinedByString: delimiter];
@@ -789,6 +789,7 @@ static NSString *sieveScriptName = @"sogo";
   SOGoUserDefaults *ud;
   SOGoDomainDefaults *dd;
   NGSieveClient *client;
+  NGImap4Client *imapClient;
   NSString *filterScript, *v;
   BOOL b, dateCapability;
   unsigned int now;
@@ -821,9 +822,21 @@ static NSString *sieveScriptName = @"sogo";
   //
   script = [NSMutableString string];
 
+  // We grab the IMAP4 delimiter using the supplied username/password
+  if (thePassword)
+    {
+      imapClient = [NGImap4Client clientWithURL: [theAccount imap4URL]];
+      [imapClient login: theUsername  password: thePassword];
+    }
+  else
+    imapClient = [[theAccount imap4Connection] client];
+
+  if (![imapClient delimiter])
+    [imapClient list: @"INBOX"  pattern: @""];
+
   // We first handle filters
   filterScript = [self sieveScriptWithRequirements: req
-                                         delimiter: [theAccount imap4Separator]];
+                                         delimiter: [imapClient delimiter]];
   if (filterScript)
     {
       if ([filterScript length])