diff --git a/sendmail.go b/sendmail.go
index f8ebccb..7595eec 100644
--- a/sendmail.go
+++ b/sendmail.go
@@ -120,17 +120,13 @@ func (m *SendMailRequest) Execute() error {
 	if err != nil {
 		return fmt.Errorf("failed issuing DATA command (%s)", err)
 	}
+	defer smtpWriter.Close()
 
 	_, err = smtpWriter.Write([]byte(msg))
 	if err != nil {
 		return fmt.Errorf("failed sending mail content (%s)", err)
 	}
 
-	err = smtpWriter.Close()
-	if err != nil {
-		return fmt.Errorf("failed close smtp client (%s)", err)
-	}
-
 	return nil
 }