diff --git a/aliyun/aliyun.go b/aliyun/aliyun.go
index 86980a5..c9063c2 100644
--- a/aliyun/aliyun.go
+++ b/aliyun/aliyun.go
@@ -25,7 +25,7 @@ type Aliyun struct {
 func NewAliyun() *Aliyun {
 	aliyun := &Aliyun{}
 	aliyun.Options = interfaces.DefaultOptions()
-	aliyun.EmailType = "Aliyun"
+	aliyun.EmailType = interfaces.EmailTypeAliyun
 	return aliyun
 }
 
diff --git a/aws/aws.go b/aws/aws.go
index ff56aaf..108ebcf 100644
--- a/aws/aws.go
+++ b/aws/aws.go
@@ -21,7 +21,7 @@ type Aws struct {
 func NewAws() *Aws {
 	aws := &Aws{}
 	aws.Options = interfaces.DefaultOptions()
-	aws.EmailType = "Aws"
+	aws.EmailType = interfaces.EmailTypeAws
 	return aws
 }
 
diff --git a/cmd/main.go b/cmd/main.go
index 04abbfa..4983197 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -18,10 +18,22 @@ func main() {
 		panic(err)
 	}
 	// 使用em进行后续操作
-	em.SetOption(ctx, interfaces.SetSmtp(&interfaces.EmailConfigDataSmtp{}))
+	em,err = em.SetOption(ctx, interfaces.SetSmtp(&interfaces.EmailConfigDataSmtp{
+		Username: "support@email.blueoceanpay.com",
+		Password: "SupporT2017",
+		ReplyTo:  "",
+		Host:     "smtpdm-ap-southeast-1.aliyun.com",
+		Port:     "80",
+	}))
+	if err != nil {
+		panic(err)
+	}
 
 	err = em.Send(ctx, interfaces.Message{
-		Form: "",
+		Form: "yun@blueoceanpay.com",
+		To: []string{"995116474@qq.com"},
+		Subject: "Test Email",
+		Body: "Hello, this is a test email.",
 	})
 	if err != nil {
 		panic(err)
diff --git a/mailgun/mailgun.go b/mailgun/mailgun.go
index f88b146..8a7ebd4 100644
--- a/mailgun/mailgun.go
+++ b/mailgun/mailgun.go
@@ -18,7 +18,7 @@ type MailGun struct {
 func NewMailGun() *MailGun {
 	mailgun := &MailGun{}
 	mailgun.Options = interfaces.DefaultOptions()
-	mailgun.EmailType = "MailGun"
+	mailgun.EmailType = interfaces.EmailTypeMailgun
 	return mailgun
 }
 
diff --git a/smtp/smtp.go b/smtp/smtp.go
index 065b597..aa71910 100644
--- a/smtp/smtp.go
+++ b/smtp/smtp.go
@@ -29,7 +29,7 @@ type Smtp struct {
 func NewSmtp() *Smtp {
 	smtp := &Smtp{}
 	smtp.Options = interfaces.DefaultOptions()
-	smtp.EmailType = "Smtp"
+	smtp.EmailType = interfaces.EmailTypeSmtp
 	return smtp
 }