diff --git a/src/send.ts b/src/send.ts
index 316215b..fbb829a 100644
--- a/src/send.ts
+++ b/src/send.ts
@@ -1,8 +1,11 @@
+import type SendmailTransport from 'npm:@types/nodemailer'
 import type { Mail } from '../types.ts'
 import { renderTemplate } from './template.tsx'
 import { transporter } from './transporter.ts'
 
-export async function send(mail: Mail) {
+export async function send(
+	mail: Mail,
+): Promise<SendmailTransport.SentMessageInfo> {
 	const { html, text } = await renderTemplate(mail.body)
 
 	return (await transporter()).sendMail({