diff --git a/NEWS b/NEWS
index 8d83f674b..11de6bcc7 100644
--- a/NEWS
+++ b/NEWS
@@ -15,6 +15,7 @@ Bug fixes
  - [web] prevented form to be marked dirty when changing password (#4138)
  - [web] restored support for SOGoLDAPContactInfoAttribute
  - [web] avoid duplicated email addresses in LDAP-based addressbook (#4129)
+ - [web] fixed mail delegation of pristine user accounts (#4160)
  - [core] cherry-picked comma escaping fix from v2 (#3296)
  - [core] fix sogo-tool restore potentially crashing on corrupted data (#4048)
  - [core] handle properly mails using windows-1255 charset (#4124)
diff --git a/SoObjects/Mailer/SOGoMailAccount.m b/SoObjects/Mailer/SOGoMailAccount.m
index 133f5296a..acfab8aa0 100644
--- a/SoObjects/Mailer/SOGoMailAccount.m
+++ b/SoObjects/Mailer/SOGoMailAccount.m
@@ -1092,13 +1092,20 @@ static NSString *inboxFolderName = @"INBOX";
 
 - (void) _setDelegates: (NSArray *) newDelegates
 {
+  NSMutableDictionary *mailSettings;
   SOGoUser *ownerUser;
   SOGoUserSettings *settings;
 
   ownerUser = [SOGoUser userWithLogin: [self ownerInContext: context]];
   settings = [ownerUser userSettings];
-  [[settings objectForKey: @"Mail"] setObject: newDelegates
-                                       forKey: @"DelegateTo"];
+  mailSettings = [settings objectForKey: @"Mail"];
+  if (!mailSettings)
+    {
+      mailSettings = [NSMutableDictionary dictionaryWithCapacity: 1];
+      [settings setObject: mailSettings forKey: @"Mail"];
+    }
+  [mailSettings setObject: newDelegates
+                   forKey: @"DelegateTo"];
   [settings synchronize];
 }
 
diff --git a/SoObjects/Mailer/SOGoUser+Mailer.m b/SoObjects/Mailer/SOGoUser+Mailer.m
index 71591cfc9..300e1249a 100644
--- a/SoObjects/Mailer/SOGoUser+Mailer.m
+++ b/SoObjects/Mailer/SOGoUser+Mailer.m
@@ -45,11 +45,18 @@
 
 - (void) _setMailDelegators: (NSArray *) newDelegators
 {
+  NSMutableDictionary *mailSettings;
   SOGoUserSettings *settings;
 
   settings = [self userSettings];
-  [[settings objectForKey: @"Mail"] setObject: newDelegators
-                                       forKey: @"DelegateFrom"];
+  mailSettings = [settings objectForKey: @"Mail"];
+  if (!mailSettings)
+    {
+      mailSettings = [NSMutableDictionary dictionaryWithCapacity: 1];
+      [settings setObject: mailSettings forKey: @"Mail"];
+    }
+  [mailSettings setObject: newDelegators
+                   forKey: @"DelegateFrom"];
   [settings synchronize];
 }