diff --git a/NEWS b/NEWS
index 203d32a8b..02b8b52a0 100644
--- a/NEWS
+++ b/NEWS
@@ -3,6 +3,7 @@
 
 Enhancements
  - [web] add constraints to start/end dates of automatic responder (#3841)
+ - [web] allow a mailbox to be deleted immediately (#3875)
  - [web] updated Angular to version 1.5.8
  - [eas] initial support for recurring tasks EAS
  - [eas] now support replied/forwarded flags using EAS (#3796)
diff --git a/UI/MailerUI/English.lproj/Localizable.strings b/UI/MailerUI/English.lproj/Localizable.strings
index 5f8a64a73..88f7070bd 100644
--- a/UI/MailerUI/English.lproj/Localizable.strings
+++ b/UI/MailerUI/English.lproj/Localizable.strings
@@ -269,6 +269,10 @@
 "quotasFormat" = "%{0}% used on %{1} MB";
 "Unable to move/delete folder." = "Unable to move/delete folder.";
 
+/* Alternative operation when folder cannot be deleted */
+"The mailbox could not be moved to the trash folder. Would you like to delete it immediately?"
+= "The mailbox could not be moved to the trash folder. Would you like to delete it immediately?";
+
 /* Confirmation message when deleting multiple messages */
 "Are you sure you want to delete the selected messages?" = "Are you sure you want to delete the selected messages?";
 
diff --git a/UI/MailerUI/UIxMailFolderActions.m b/UI/MailerUI/UIxMailFolderActions.m
index 7435b5483..821458788 100644
--- a/UI/MailerUI/UIxMailFolderActions.m
+++ b/UI/MailerUI/UIxMailFolderActions.m
@@ -212,42 +212,106 @@
   return destURL;
 }
 
-- (WOResponse *) deleteAction
+- (void) _removeFolder
 {
-  NSString *currentMailbox, *currentAccount, *keyForMsgUIDs;
-  NSMutableDictionary *moduleSettings, *threadsCollapsed;
   NGImap4Connection *connection;
-  SOGoMailFolder *co, *inbox;
-  NSDictionary *jsonResponse;
-  NSURL *srcURL, *destURL;
+  NSMutableDictionary *moduleSettings, *threadsCollapsed;;
+  NSString *keyForMsgUIDs, *currentMailbox, *currentAccount;
+  NSURL *srcURL;
+  SOGoMailFolder *co;
   SOGoUserSettings *us;
-  WOResponse *response;
-  NSException *error;
-  BOOL moved;
 
   co = [self clientObject];
+  srcURL = [co imap4URL];
+  connection = [co imap4Connection];
+
+  // Unsubscribe from mailbox
+  [[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"];
+
+  if (threadsCollapsed)
+    {
+      currentMailbox = [co nameInContainer];
+      currentAccount = [[co container] nameInContainer];
+      keyForMsgUIDs = [NSString stringWithFormat:@"/%@/%@", currentAccount, currentMailbox];
+      if ([threadsCollapsed objectForKey: keyForMsgUIDs])
+        {
+          [threadsCollapsed removeObjectForKey: keyForMsgUIDs];
+          [us synchronize];
+        }
+    }
+}
+
+- (WOResponse *) deleteAction
+{
+  NSDictionary *jsonRequest, *jsonResponse;
+  NGImap4Connection *connection;
+  SOGoMailFolder *co, *inbox;
+  NSURL *srcURL, *destURL;
+  WORequest *request;
+  WOResponse *response;
+  NSException *error;
+  BOOL moved, withTrash;
+
+  request = [context request];
+  co = [self clientObject];
+  srcURL = [co imap4URL];
+  jsonRequest = [[request contentAsString] objectFromJSONString];
+  withTrash = ![[jsonRequest objectForKey: @"withoutTrash"] boolValue];
   moved = YES;
 
-  if ([co ensureTrashFolder])
+  if (withTrash)
     {
-      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]])
+      if ([co ensureTrashFolder])
         {
-          error = [connection deleteMailboxAtURL: srcURL];
-          moved = NO;
+          connection = [co imap4Connection];
+          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)
+            {
+              jsonResponse = [NSDictionary dictionaryWithObject: [self labelForKey: @"Unable to move/delete folder." inContext: context]
+                                                         forKey: @"error"];
+              response = [self responseWithStatus: 500 andJSONRepresentation: jsonResponse];
+            }
+          else
+            {
+              // We unsubscribe to the old one, and subscribe back to the new one
+              if (moved)
+                [[connection client] subscribe: [destURL path]];
+              [self _removeFolder];
+              response = [self responseWith204];
+            }
         }
       else
-        error = [connection moveMailboxAtURL: srcURL toURL: destURL];
+        {
+          jsonResponse = [NSDictionary dictionaryWithObject: [self labelForKey: @"Unable to move/delete folder." inContext: context]
+                                                     forKey: @"message"];
+          response = [self responseWithStatus: 500 andJSONRepresentation: jsonResponse];
+        }
+    }
+  else
+    {
+      // Immediately delete mailbox
+      connection = [co imap4Connection];
+      error = [connection deleteMailboxAtURL: srcURL];
       if (error)
         {
           jsonResponse = [NSDictionary dictionaryWithObject: [self labelForKey: @"Unable to move/delete folder." inContext: context]
@@ -256,36 +320,10 @@
         }
       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];
-                }
-            }
+          [self _removeFolder];
           response = [self responseWith204];
         }
     }
-  else
-    {
-      jsonResponse = [NSDictionary dictionaryWithObject: [self labelForKey: @"Unable to move/delete folder." inContext: context]
-                                                 forKey: @"message"];
-      response = [self responseWithStatus: 500 andJSONRepresentation: jsonResponse];
-    }
 
   return response;
 }
@@ -773,7 +811,6 @@
 - (WOResponse *) _subscribeOrUnsubscribeAction: (BOOL) subscribing
 {
   NGImap4Client *client;
-  WOResponse *response;
   SOGoMailFolder *co;
   NSDictionary *d;
 
diff --git a/UI/WebServerResources/js/Mailer/Mailbox.service.js b/UI/WebServerResources/js/Mailer/Mailbox.service.js
index 08ddd8b97..0d7efe827 100644
--- a/UI/WebServerResources/js/Mailer/Mailbox.service.js
+++ b/UI/WebServerResources/js/Mailer/Mailbox.service.js
@@ -620,12 +620,13 @@
    * @function $delete
    * @memberof Mailbox.prototype
    * @desc Delete the mailbox from the server
+   * @param {object} [options] - additional options (use {withoutTrash: true} to delete immediately)
    * @returns a promise of the HTTP operation
    */
-  Mailbox.prototype.$delete = function() {
+  Mailbox.prototype.$delete = function(options) {
     var _this = this;
 
-    return Mailbox.$$resource.remove(this.id)
+    return Mailbox.$$resource.post(this.id, 'delete', options)
       .then(function() {
         _this.$account.$getMailboxes({reload: true});
         return true;
@@ -674,6 +675,7 @@
    * @function $deleteMessages
    * @memberof Mailbox.prototype
    * @desc Delete multiple messages from mailbox.
+   * @param {object} [options] - additional options (use {withoutTrash: true} to delete immediately)
    * @return a promise of the HTTP operation
    */
   Mailbox.prototype.$deleteMessages = function(messages, options) {
diff --git a/UI/WebServerResources/js/Mailer/MailboxController.js b/UI/WebServerResources/js/Mailer/MailboxController.js
index b00ee33bb..1a7819514 100644
--- a/UI/WebServerResources/js/Mailer/MailboxController.js
+++ b/UI/WebServerResources/js/Mailer/MailboxController.js
@@ -311,7 +311,7 @@
       var selectedMessages = vm.selectedFolder.$selectedMessages();
 
       if (messageDialog === null && _.size(selectedMessages) > 0)
-        messageDialog = Dialog.confirm(l('Warning'),
+        messageDialog = Dialog.confirm(l('Confirmation'),
                                        l('Are you sure you want to delete the selected messages?'),
                                        { ok: l('Delete') })
         .then(function() {
diff --git a/UI/WebServerResources/js/Mailer/MailboxesController.js b/UI/WebServerResources/js/Mailer/MailboxesController.js
index e2f2a2801..8ad7c5b98 100644
--- a/UI/WebServerResources/js/Mailer/MailboxesController.js
+++ b/UI/WebServerResources/js/Mailer/MailboxesController.js
@@ -344,14 +344,26 @@
     }
 
     function confirmDelete(folder) {
-      Dialog.confirm(l('Confirmation'), l('Do you really want to move this folder into the trash ?'))
+      Dialog.confirm(l('Warning'),
+                     l('Do you really want to move this folder into the trash ?'),
+                     { ok: l('Delete') })
         .then(function() {
           folder.$delete()
             .then(function() {
               $state.go('mail.account.inbox');
-            }, function(data, status) {
-              Dialog.alert(l('An error occured while deleting the mailbox "%{0}".', folder.name),
-                           l(data.error));
+            }, function(response) {
+              Dialog.confirm(l('Warning'),
+                             l('The mailbox could not be moved to the trash folder. Would you like to delete it immediately?'),
+                             { ok: l('Delete') })
+              .then(function() {
+                folder.$delete({ withoutTrash: true })
+                  .then(function() {
+                    $state.go('mail.account.inbox');
+                  }, function(response) {
+                    Dialog.alert(l('An error occured while deleting the mailbox "%{0}".', folder.name),
+                                 l(response.error));
+                  });
+              });
             });
         });
     }