diff --git a/email/engine.go b/email/engine.go
index a061efa..a4d2dad 100644
--- a/email/engine.go
+++ b/email/engine.go
@@ -45,7 +45,7 @@ func ToHTML(mdtext string) (template.HTML, error) {
 }
 
 func Parse(b *Body) (string, error) {
-	b.App = app
+	merge(&b.App)
 	buf := &bytes.Buffer{}
 	err := engine.Execute(buf, b)
 	if err != nil {
@@ -58,3 +58,21 @@ func Parse(b *Body) (string, error) {
 	html, err := pre.Transform()
 	return html, err
 }
+
+func merge(base *App) {
+	if base.Name == "" {
+		base.Name = app.Name
+	}
+	if base.Link == "" {
+		base.Link = app.Link
+	}
+	if base.Logo == "" {
+		base.Logo = app.Logo
+	}
+	if base.Copyright == "" {
+		base.Copyright = app.Copyright
+	}
+	if base.TroubleText == "" {
+		base.TroubleText = app.TroubleText
+	}
+}
diff --git a/email/service.go b/email/service.go
index fd12841..cef0150 100644
--- a/email/service.go
+++ b/email/service.go
@@ -22,13 +22,17 @@ func (srv *Service) Init() error {
 	app.Link = viper.GetString("server.url")
 	app.Logo = viper.GetString("logo")
 
-	dial = gomail.NewDialer(
+	dial = DefaultDailer()
+
+	return nil
+}
+
+func DefaultDailer() *gomail.Dialer {
+	return gomail.NewDialer(
 		viper.GetString("email.host"),
 		viper.GetInt("email.port"),
 		viper.GetString("email.username"),
 		viper.GetString("email.password"))
-
-	return nil
 }
 
 func setupDefault() {
@@ -40,3 +44,11 @@ func setupDefault() {
 	app.TroubleText = "If you’re having trouble with the button '{ACTION}', copy and paste the URL below into your web browser."
 	dial = gomail.NewDialer("mail.kumoly.io", 587, "test@kumoly.io", "test")
 }
+
+func SetDefault(a App) {
+	app = a
+}
+
+func SetDailer(d *gomail.Dialer) {
+	dial = d
+}