diff --git a/src/Service/FCMSender.php b/src/Service/FCMSender.php
index 87526f87..c3d962f1 100644
--- a/src/Service/FCMSender.php
+++ b/src/Service/FCMSender.php
@@ -12,6 +12,8 @@ use App\Entity\JobOrder;
 use App\Entity\Subscription;
 use Exception;
 use RuntimeException;
+use DateTime;
+use DateInterval;
 
 class FCMSender
 {
@@ -246,11 +248,23 @@ class FCMSender
             return false;
         }
 
+        // get device timestamp cutoff
+        $oldest_timestamp = (new DateTime())->sub(new DateInterval('P1M'));
+
         // send to every customer session
         foreach ($sessions as $sess) {
             $device_id = $sess->getDevicePushID();
 
-            if (!empty($device_id) && !isset($device_ids[$device_id])) {
+            // ignore duplicates and empty device IDs
+            if (empty($device_id) || isset($device_ids[$device_id])) {
+                continue;
+            }
+
+            // get latest device timestamp
+            $latest_timestamp = $sess->getDateLatestActivity();
+
+            // make sure we only send to devices that have been active on or after the cutoff
+            if ($latest_timestamp >= $oldest_timestamp) {
                 // send to this device
                 $device_ids[$device_id] = true;
             }