diff --git a/app/config/env/platformsh.php b/app/config/env/platformsh.php
index 5c5bf69979..133ead67cb 100644
--- a/app/config/env/platformsh.php
+++ b/app/config/env/platformsh.php
@@ -36,6 +36,11 @@
     $container->setParameter('cluster_database_name', 'cluster');
 }
 
+// If mailer_host as default value, then set it to platform.sh' default instead
+if ($container->getParameter('mailer_host') === '127.0.0.1') {
+    $container->setParameter('mailer_host', getenv('PLATFORM_SMTP_HOST'));
+}
+
 // PLATFORMSH_DFS_NFS_PATH is different compared to DFS_NFS_PATH in the sense that it is relative to ezplatform dir
 // DFS_NFS_PATH is an absolute path
 if ($dfsNfsPath = getenv('PLATFORMSH_DFS_NFS_PATH')) {