From 1dd37c4386d78c1685bbe6cc9cf84147147486ac Mon Sep 17 00:00:00 2001
From: Tajim <com.tajim@gmail.com>
Date: Wed, 2 Sep 2026 10:53:39 +0600
Subject: [PATCH] feat(mail): add multi-smtp roundrobin configuration

---
 .env.example    | 13 +++++++++++++
 config/mail.php | 29 +++++++++++++++++++++++++----
 2 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/.env.example b/.env.example
index 6b661041..b322f45f 100644
--- a/.env.example
+++ b/.env.example
@@ -68,6 +68,19 @@ MAIL_PASSWORD=null
 MAIL_FROM_ADDRESS="hello@example.com"
 MAIL_FROM_NAME="${APP_NAME}"
 
+# Multi-SMTP / Round-Robin (optional)
+# MAIL_ROUNDROBIN_MAILERS="smtp,smtp2,smtp3"
+# MAIL2_SCHEME=null
+# MAIL2_HOST=127.0.0.1
+# MAIL2_PORT=2525
+# MAIL2_USERNAME=null
+# MAIL2_PASSWORD=null
+# MAIL3_SCHEME=null
+# MAIL3_HOST=127.0.0.1
+# MAIL3_PORT=2525
+# MAIL3_USERNAME=null
+# MAIL3_PASSWORD=null
+
 AWS_ACCESS_KEY_ID=
 AWS_SECRET_ACCESS_KEY=
 AWS_DEFAULT_REGION=auto
diff --git a/config/mail.php b/config/mail.php
index e32e88da..2240afd7 100644
--- a/config/mail.php
+++ b/config/mail.php
@@ -49,6 +49,30 @@
             'local_domain' => env('MAIL_EHLO_DOMAIN', parse_url((string) env('APP_URL', 'http://localhost'), PHP_URL_HOST)),
         ],
 
+        'smtp2' => [
+            'transport' => 'smtp',
+            'scheme' => env('MAIL2_SCHEME'),
+            'url' => env('MAIL2_URL'),
+            'host' => env('MAIL2_HOST', '127.0.0.1'),
+            'port' => env('MAIL2_PORT', 2525),
+            'username' => env('MAIL2_USERNAME'),
+            'password' => env('MAIL2_PASSWORD'),
+            'timeout' => null,
+            'local_domain' => env('MAIL_EHLO_DOMAIN', parse_url((string) env('APP_URL', 'http://localhost'), PHP_URL_HOST)),
+        ],
+
+        'smtp3' => [
+            'transport' => 'smtp',
+            'scheme' => env('MAIL3_SCHEME'),
+            'url' => env('MAIL3_URL'),
+            'host' => env('MAIL3_HOST', '127.0.0.1'),
+            'port' => env('MAIL3_PORT', 2525),
+            'username' => env('MAIL3_USERNAME'),
+            'password' => env('MAIL3_PASSWORD'),
+            'timeout' => null,
+            'local_domain' => env('MAIL_EHLO_DOMAIN', parse_url((string) env('APP_URL', 'http://localhost'), PHP_URL_HOST)),
+        ],
+
         'ses' => [
             'transport' => 'ses',
         ],
@@ -90,10 +114,7 @@
 
         'roundrobin' => [
             'transport' => 'roundrobin',
-            'mailers' => [
-                'ses',
-                'postmark',
-            ],
+            'mailers' => explode(',', env('MAIL_ROUNDROBIN_MAILERS', 'smtp,smtp2')),
             'retry_after' => 60,
         ],