diff --git a/config.example.json b/config.example.json
index 895e46c..824c197 100644
--- a/config.example.json
+++ b/config.example.json
@@ -6,5 +6,11 @@
 	"mysql_user": "USER",
 	"mysql_password": "PASS",
 	"mysql_database": "db",
-	"amoj_regist": "h200"
-}
\ No newline at end of file
+	"amoj_regist": "h200",
+	"smtp_host": "mail.example.net",
+	"smtp_port": 587,
+	"smtp_auth": true,
+	"smtp_user": "USER",
+	"smtp_pass": "PASS",
+	"smtp_secure": "starttls"
+}
diff --git a/web/classes/UserUtil.php b/web/classes/UserUtil.php
index 9dc63d6..ff65588 100644
--- a/web/classes/UserUtil.php
+++ b/web/classes/UserUtil.php
@@ -1,5 +1,6 @@
 <?php
 	use PHPMailer\PHPMailer\PHPMailer;
+	use PHPMailer\PHPMailer\SMTP;
 	use PHPMailer\PHPMailer\Exception;
 
 	require_once dirname(__DIR__)."/vendor/autoload.php";
@@ -164,7 +165,25 @@ private function sendUtf8Email($to, $from, $subject, $message) {
 			$mail = new PHPMailer();
 			$mail->CharSet = PHPMailer::CHARSET_UTF8;
 			$mail->Encoding = PHPMailer::ENCODING_QUOTED_PRINTABLE;
-			$mail->isSendmail();
+
+			$smtp_host = ConfigUtil::getInstance()->getConfig()["smtp_host"];
+			if (!isset($smtp_host) || $smtp_host == "") {
+				$mail->isSendmail();
+			} else {
+				$mail->isSMTP();
+				$mail->Host = $smtp_host;
+				$mail->Port = ConfigUtil::getInstance()->getConfig()["smtp_port"];
+				$mail->SMTPAuth = ConfigUtil::getInstance()->getConfig()["smtp_auth"];
+				if ($mail->SMTPAuth) {
+					$mail->Username = ConfigUtil::getInstance()->getConfig()["smtp_user"];
+					$mail->Password = ConfigUtil::getInstance()->getConfig()["smtp_pass"];
+				}
+				switch (ConfigUtil::getInstance()->getConfig()["smtp_secure"]) {
+					case 'smtps': $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS; break;
+					case 'starttls': $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS; break;
+				}
+			}
+
 			$mail->setFrom($from);
 			$mail->addAddress($to);
 			$mail->Subject = $subject;