diff --git a/NEWS b/NEWS
index 37e4ee5ff..fe7e44ba3 100644
--- a/NEWS
+++ b/NEWS
@@ -10,6 +10,7 @@ Enhancements
 Bug fixes
  - [eas] fixed long GUID issue preventing sometimes synchronisation (#3460)
  - [web] improved extraction of HTML signature in Preferences module
+ - [web] really delete mailboxes being deleted from the Trash folder (#595, #1189, #641)
 
 2.3.13 (2016-07-06)
 -------------------
diff --git a/UI/MailerUI/UIxMailFolderActions.m b/UI/MailerUI/UIxMailFolderActions.m
index 7b068b863..f7184e72e 100644
--- a/UI/MailerUI/UIxMailFolderActions.m
+++ b/UI/MailerUI/UIxMailFolderActions.m
@@ -132,22 +132,23 @@
 }
 
 - (NSURL *) _trashedURLOfFolder: (NSURL *) srcURL
-			 withCO: (SOGoMailFolder *) co
+                     withObject: (SOGoMailFolder *) co
 {
-  NSURL *destURL;
   NSString *trashFolderName, *folderName, *path, *testPath;
   NGImap4Connection *connection;
-  int i = 1;
+  NSURL *destURL;
   id test;
+  int i;
 
   connection = [co imap4Connection];
-
   folderName = [[srcURL path] lastPathComponent];
   trashFolderName
     = [[co mailAccountFolder] trashFolderNameInContext: context];
   path = [NSString stringWithFormat: @"/%@/%@",
 		   trashFolderName, folderName];
   testPath = path;
+  i = 1;
+
   while ( i < 10 )
     {
       test = [[connection client] select: testPath];
@@ -163,7 +164,7 @@
         }
     }
   destURL = [[NSURL alloc] initWithScheme: [srcURL scheme]
-			   host: [srcURL host] path: path];
+                                     host: [srcURL host] path: path];
   [destURL autorelease];
 
   return destURL;
@@ -171,60 +172,76 @@
 
 - (WOResponse *) deleteAction
 {
+  NSString *currentMailbox, *currentAccount, *keyForMsgUIDs;
+  NSMutableDictionary *moduleSettings, *threadsCollapsed;
+  NGImap4Connection *connection;
   SOGoMailFolder *co, *inbox;
+  NSURL *srcURL, *destURL;
   SOGoUserSettings *us;
   WOResponse *response;
-  NGImap4Connection *connection;
   NSException *error;
-  NSURL *srcURL, *destURL;
-  NSMutableDictionary *moduleSettings, *threadsCollapsed;
-  NSString *currentMailbox, *currentAccount, *keyForMsgUIDs;
+
+  BOOL moved;
 
   co = [self clientObject];
-  if ([co ensureTrashFolder])
-  {
-    connection = [co imap4Connection];
-    srcURL = [co imap4URL];
-    destURL = [self _trashedURLOfFolder: srcURL withCO: co];
-    connection = [co imap4Connection];
-    inbox = [[co mailAccountFolder] inboxFolderInContext: context];
-    [[connection client] select: [inbox absoluteImap4Name]];
-    error = [connection moveMailboxAtURL: srcURL toURL: destURL];
-    if (error)
-      {
-        response = [self responseWithStatus: 500];
-        [response appendContentString: @"Unable to move folder."];
-      }
-    else
-      {
-        // We unsubscribe to the old one, and subscribe back to the new one
-        [[connection client] subscribe: [destURL path]];
-        [[connection client] unsubscribe: [srcURL path]];
-    
-         // Verify if the current folder have any collapsed threads save under it name and erase it
-         us = [[context activeUser] userSettings];
-         moduleSettings = [us objectForKey: @"Mail"];
-         threadsCollapsed = [moduleSettings objectForKey:@"threadsCollapsed"];
-         currentMailbox = [co nameInContainer];
-         currentAccount = [[co container] nameInContainer];
-         keyForMsgUIDs = [NSString stringWithFormat:@"/%@/%@", currentAccount, currentMailbox];
+  moved = YES;
 
-         if (threadsCollapsed)
-           {
-             if ([threadsCollapsed objectForKey:keyForMsgUIDs])
-               {
-                  [threadsCollapsed removeObjectForKey:keyForMsgUIDs];
+  if ([co ensureTrashFolder])
+    {
+      connection = [co imap4Connection];
+      srcURL = [co imap4URL];
+      destURL = [self _trashedURLOfFolder: srcURL withObject: co];
+      connection = [co imap4Connection];
+      inbox = [[co mailAccountFolder] inboxFolderInContext: context];
+      [[connection client] select: [inbox absoluteImap4Name]];
+
+      // If srcURL is a prefix of destURL, that means we are deleting
+      // the folder within the 'Trash' folder, as it's getting renamed
+      // over and over with an integer suffix (in trashedURLOfFolder:...)
+      // If that is the case, we simple delete the folder, instead of renaming it
+      if ([[destURL path] hasPrefix: [srcURL path]])
+        {
+          error = [connection deleteMailboxAtURL: srcURL];
+          moved = NO;
+        }
+      else
+        error = [connection moveMailboxAtURL: srcURL toURL: destURL];
+      if (error)
+        {
+          response = [self responseWithStatus: 500];
+          [response appendContentString: [self labelForKey: @"Unable to move/delete folder." inContext: context]];
+        }
+      else
+        {
+          // We unsubscribe to the old one, and subscribe back to the new one
+          if (moved)
+            [[connection client] subscribe: [destURL path]];
+          [[connection client] unsubscribe: [srcURL path]];
+
+          // Verify if the current folder have any collapsed threads save under it name and erase it
+          us = [[context activeUser] userSettings];
+          moduleSettings = [us objectForKey: @"Mail"];
+          threadsCollapsed = [moduleSettings objectForKey: @"threadsCollapsed"];
+          currentMailbox = [co nameInContainer];
+          currentAccount = [[co container] nameInContainer];
+          keyForMsgUIDs = [NSString stringWithFormat:@"/%@/%@", currentAccount, currentMailbox];
+
+          if (threadsCollapsed)
+            {
+              if ([threadsCollapsed objectForKey: keyForMsgUIDs])
+                {
+                  [threadsCollapsed removeObjectForKey: keyForMsgUIDs];
                   [us synchronize];
-               }
-           }
-        response = [self responseWith204];
-      }
-  }
+                }
+            }
+          response = [self responseWith204];
+        }
+    }
   else
-  {
-    response = [self responseWithStatus: 500];
-    [response appendContentString: @"Unable to move folder."];
-  }
+    {
+      response = [self responseWithStatus: 500];
+      [response appendContentString: [self labelForKey: @"Unable to move/delete folder." inContext: context]];
+    }
 
   return response;
 }
@@ -716,7 +733,6 @@
   WOResponse *response;
   WORequest *request;
   SOGoMailFolder *co;
-  NSException *error;
   NSArray *msgUIDs;
   NSMutableArray *flags;
   NSString *operation;