diff --git a/FlowCrypt/Controllers/Inbox/InboxViewController.swift b/FlowCrypt/Controllers/Inbox/InboxViewController.swift
index 82c35a15f..01936fbf4 100644
--- a/FlowCrypt/Controllers/Inbox/InboxViewController.swift
+++ b/FlowCrypt/Controllers/Inbox/InboxViewController.swift
@@ -51,6 +51,7 @@ final class InboxViewController: ASDKViewController<ASDisplayNode> {
 
     private let messageProvider: MessagesListProvider
     private let decorator: InboxViewDecoratorType
+    private let enterpriseServerApi: EnterpriseServerApiType
     private let refreshControl = UIRefreshControl()
     private let tableNode: ASTableNode
     private lazy var composeButton = ComposeButtonNode { [weak self] in
@@ -63,11 +64,13 @@ final class InboxViewController: ASDKViewController<ASDisplayNode> {
     init(
         _ viewModel: InboxViewModel,
         messageProvider: MessagesListProvider = MailProvider.shared.messageListProvider,
-        decorator: InboxViewDecoratorType = InboxViewDecorator()
+        decorator: InboxViewDecoratorType = InboxViewDecorator(),
+        enterpriseServerApi: EnterpriseServerApiType = EnterpriseServerApi()
     ) {
         self.viewModel = viewModel
         self.messageProvider = messageProvider
         self.decorator = decorator
+        self.enterpriseServerApi = enterpriseServerApi
         tableNode = TableNode()
 
         super.init(node: ASDisplayNode())
@@ -88,6 +91,7 @@ final class InboxViewController: ASDKViewController<ASDisplayNode> {
         setupUI()
         setupNavigationBar()
         fetchAndRenderEmails(nil)
+        checkFES()
     }
 
     override func viewWillAppear(_ animated: Bool) {
@@ -241,6 +245,14 @@ extension InboxViewController {
             showAlert(error: error, message: "message_failed_load".localized)
         }
     }
+
+    private func checkFES() {
+        enterpriseServerApi.getActiveFesUrlForCurrentUser()
+            .then(on: .main) { [weak self] urlString in
+                guard let urlString = urlString else { return }
+                self?.showToast("FES at \(urlString) not supported on iOS yet")
+            }
+    }
 }
 
 // MARK: - Action handlers
diff --git a/FlowCrypt/Functionality/Services/EnterpriseServerApi.swift b/FlowCrypt/Functionality/Services/EnterpriseServerApi.swift
index 3b33f2377..861660669 100644
--- a/FlowCrypt/Functionality/Services/EnterpriseServerApi.swift
+++ b/FlowCrypt/Functionality/Services/EnterpriseServerApi.swift
@@ -10,6 +10,7 @@ import Promises
 
 protocol EnterpriseServerApiType {
     func getActiveFesUrl(for email: String) -> Promise<String?>
+    func getActiveFesUrlForCurrentUser() -> Promise<String?>
 }
 
 class EnterpriseServerApi: EnterpriseServerApiType {
@@ -21,6 +22,15 @@ class EnterpriseServerApi: EnterpriseServerApiType {
         static let serviceNeededValue = "enterprise-server"
     }
 
+    func getActiveFesUrlForCurrentUser() -> Promise<String?> {
+        guard let email = DataService.shared.currentUser?.email else {
+            return Promise<String?> { resolve, _ in
+                resolve(nil)
+            }
+        }
+        return getActiveFesUrl(for: email)
+    }
+
     func getActiveFesUrl(for email: String) -> Promise<String?> {
         Promise<String?> { resolve, _ in
             guard let userDomain = email.recipientDomain,