diff --git a/index.d.ts b/index.d.ts
index 6f0d4df..b1e9f44 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -167,6 +167,9 @@ declare global {
          * @param options email options map
          */
         sendMail(options: {
+            host?: string
+            username?: string
+            password?: string
             to: string | string[]
             cc?: string | string[]
             bcc?: string | string[]