diff --git a/Documentation/SOGoInstallationGuide.asciidoc b/Documentation/SOGoInstallationGuide.asciidoc
index 717367edc..3089ebc67 100644
--- a/Documentation/SOGoInstallationGuide.asciidoc
+++ b/Documentation/SOGoInstallationGuide.asciidoc
@@ -1351,7 +1351,7 @@ otherwise the CAS server will complain:
 ----
 ERROR [org.jasig.cas.CentralAuthenticationServiceImpl] - ServiceTicket
 [ST-31740-hoV1brhhwMNfnBkSMVUw-ocas] with service [imap://myimapserver
-does not match supplied service [sieve://mysieveserver:2000]
+does not match supplied service [sieve://mysieveserver:4190]
 ----
 
 Finally, when using imapproxy to speed up the imap accesses, the
@@ -1895,8 +1895,8 @@ URL, such as:
 
 [options="compact"]
 * `sieve://127.0.0.1`
-* `sieve://127.0.0.1:2000`
-* `sieve://127.0.0.1:2000/?tls=YES`
+* `sieve://127.0.0.1:4190`
+* `sieve://127.0.0.1:4190/?tls=YES`
 
 Note that TLS is supported but SSL is not.
 
@@ -3073,6 +3073,10 @@ current version of SOGo from the previous release.
 
 [cols="100a"]
 |=======================================================================
+h|4.1.0
+|The default port for the SOGoSieveServer default is now 4190 (previously
+2000). You need to explicitly set the port if you use a different port.
+
 h|4.0.0
 |Run the shell script `sql-update-3.2.10_to_4.0.0.sh` or
 `sql-update-3.2.10_to_4.0.0-mysql.sh` (if you are using MySQL).
diff --git a/NEWS b/NEWS
index b1e961469..2e7a813be 100644
--- a/NEWS
+++ b/NEWS
@@ -1,4 +1,4 @@
-4.0.9 (2019-XX-XX)
+4.1.0 (2019-XX-XX)
 ------------------
 
 New features
@@ -13,9 +13,10 @@ Enhancements
  - [web] improve constrat of text in toolbar with input fields
  - [web] updated Angular Material to version 1.1.20
  - [core] now dynamically detect and use the IMAP separator (#1490)
+ - [core] default Sieve port is now 4190 (#4826)
 
 Bug fixes
- - [web] properly handle Windows-1256 charaset (#4781)
+ - [web] properly handle Windows-1256 charset (#4781)
  - [web] fixed saving value of receipt action for main IMAP account
  - [web] fixed search results in Calendar module when targeting all events
  - [web] properly encode URL of cards from exteral sources
diff --git a/SoObjects/SOGo/SOGoSieveManager.m b/SoObjects/SOGo/SOGoSieveManager.m
index d917a20fb..799a49dda 100644
--- a/SoObjects/SOGo/SOGoSieveManager.m
+++ b/SoObjects/SOGo/SOGoSieveManager.m
@@ -1,6 +1,6 @@
 /* SOGoSieveManager.m - this file is part of SOGo
  *
- * Copyright (C) 2010-2016 Inverse inc.
+ * Copyright (C) 2010-2019 Inverse inc.
  *
  * Author: Inverse <info@inverse.ca>
  *
@@ -673,10 +673,10 @@ static NSString *sieveScriptName = @"sogo";
   // sieveServer might have the following format:
   //
   // sieve://localhost
-  // sieve://localhost:2000
-  // sieve://localhost:2000/?tls=YES
+  // sieve://localhost:4190
+  // sieve://localhost:4190/?tls=YES
   //
-  // Values such as "localhost" or "localhost:2000" are NOT supported.
+  // Values such as "localhost" or "localhost:4190" are NOT supported.
   //
   // We first try to get the user's preferred Sieve server
   sieveServer = [[[user mailAccounts] objectAtIndex: 0] objectForKey: @"sieveServerName"];
@@ -710,7 +710,7 @@ static NSString *sieveScriptName = @"sogo";
     if ([url port])
       sievePort = [[url port] intValue];
     else
-      sievePort = 2000;
+      sievePort = 4190;
 
   sieveQuery = [cUrl query] ? [cUrl query] : [url query];
   if (sieveQuery)