diff --git a/apps/ios/Shared/Model/SimpleXAPI.swift b/apps/ios/Shared/Model/SimpleXAPI.swift
index a0a32156c4..9297aa7898 100644
--- a/apps/ios/Shared/Model/SimpleXAPI.swift
+++ b/apps/ios/Shared/Model/SimpleXAPI.swift
@@ -743,6 +743,12 @@ func apiConnect_(incognito: Bool, connReq: String) async -> ((ConnReqType, Pendi
             message: "Unless your contact deleted the connection or this link was already used, it might be a bug - please report it.\nTo connect, please ask your contact to create another connection link and check that you have a stable network connection."
         )
         return (nil, alert)
+    case .chatCmdError(_, .errorAgent(.SMP(_, .QUOTA))):
+        let alert = mkAlert(
+            title: "Undelivered messages",
+            message: "The connection reached the limit of undelivered messages, your contact may be offline."
+        )
+        return (nil, alert)
     case let .chatCmdError(_, .errorAgent(.INTERNAL(internalErr))):
         if internalErr == "SEUniqueID" {
             let alert = mkAlert(
diff --git a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt
index eec7a0f30d..9f0ed746a4 100644
--- a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt
+++ b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/SimpleXAPI.kt
@@ -1226,6 +1226,15 @@ object ChatController {
         )
         return null
       }
+      r is CR.ChatCmdError && r.chatError is ChatError.ChatErrorAgent
+          && r.chatError.agentError is AgentErrorType.SMP
+          && r.chatError.agentError.smpErr is SMPErrorType.QUOTA -> {
+        AlertManager.shared.showAlertMsg(
+          generalGetString(MR.strings.connection_error_quota),
+          generalGetString(MR.strings.connection_error_quota_desc)
+        )
+        return null
+      }
       else -> {
         if (!(networkErrorAlert(r))) {
           apiErrorAlert("apiConnect", generalGetString(MR.strings.connection_error), r)
diff --git a/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml b/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml
index bb755f2b58..fd6988d5e8 100644
--- a/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml
+++ b/apps/multiplatform/common/src/commonMain/resources/MR/base/strings.xml
@@ -144,6 +144,8 @@
   <string name="please_check_correct_link_and_maybe_ask_for_a_new_one">Please check that you used the correct link or ask your contact to send you another one.</string>
   <string name="connection_error_auth">Connection error (AUTH)</string>
   <string name="connection_error_auth_desc">Unless your contact deleted the connection or this link was already used, it might be a bug - please report it.\nTo connect, please ask your contact to create another connection link and check that you have a stable network connection.</string>
+  <string name="connection_error_quota">Undelivered messages</string>
+  <string name="connection_error_quota_desc">The connection reached the limit of undelivered messages, your contact may be offline.</string>
   <string name="error_accepting_contact_request">Error accepting contact request</string>
   <string name="sender_may_have_deleted_the_connection_request">Sender may have deleted the connection request.</string>
   <string name="error_deleting_contact">Error deleting contact</string>