diff --git a/app/config/errors.php b/app/config/errors.php
index 87ddce6306..634eed71cc 100644
--- a/app/config/errors.php
+++ b/app/config/errors.php
@@ -524,6 +524,11 @@ return [
         'description' => 'The project key has expired. Please generate a new key using the Appwrite console.',
         'code' => 401,
     ],
+    Exception::PROJECT_SMTP_CONFIG_INVALID => [
+        'name' => Exception::PROJECT_SMTP_CONFIG_INVALID,
+        'description' => 'Provided SMTP config is invalid.',
+        'code' => 400,
+    ],
     Exception::PROJECT_TEMPLATE_DEFAULT_DELETION => [
         'name' => Exception::PROJECT_TEMPLATE_DEFAULT_DELETION,
         'description' => 'The default template for the project cannot be deleted.',
diff --git a/app/controllers/api/projects.php b/app/controllers/api/projects.php
index 09af5daa8a..a83613301c 100644
--- a/app/controllers/api/projects.php
+++ b/app/controllers/api/projects.php
@@ -39,6 +39,7 @@ use Utopia\Validator\Text;
 use Utopia\Validator\WhiteList;
 use Appwrite\Template\Template;
 use Utopia\Locale\Locale;
+use PHPMailer\PHPMailer\PHPMailer;
 
 App::init()
     ->groups(['projects'])
@@ -1634,6 +1635,21 @@ App::patch('/v1/projects/:projectId/smtp')
             throw new Exception(Exception::PROJECT_NOT_FOUND);
         }
 
+        // validate SMTP settings
+        $mail = new PHPMailer(true);
+        $mail->isSMTP();
+        $mail->Username = $username;
+        $mail->Password = $password;
+        $mail->Host = $host;
+        $mail->Port = $port;
+        $mail->SMTPSecure = $secure;
+        $mail->SMTPAutoTLS = false;
+        $valid = $mail->SmtpConnect();
+
+        if(!$valid) {
+            throw new Exception(Exception::GENERAL_SMTP_DISABLED);
+        }
+
         $smtp = [
             'enabled' => $enabled,
             'sender' => $sender,
diff --git a/src/Appwrite/Extend/Exception.php b/src/Appwrite/Extend/Exception.php
index 0f488d96f9..e7e66e1c72 100644
--- a/src/Appwrite/Extend/Exception.php
+++ b/src/Appwrite/Extend/Exception.php
@@ -164,6 +164,8 @@ class Exception extends \Exception
     public const PROJECT_RESERVED_PROJECT          = 'project_reserved_project';
     public const PROJECT_KEY_EXPIRED               = 'project_key_expired';
 
+    public const PROJECT_SMTP_CONFIG_INVALID       = 'project_smtp_config_invalid';
+
     public const PROJECT_TEMPLATE_DEFAULT_DELETION = 'project_template_default_deletion';
 
     /** Webhooks */