diff --git a/src/transporter.ts b/src/transporter.ts
index 61794c2..7c27269 100644
--- a/src/transporter.ts
+++ b/src/transporter.ts
@@ -1,16 +1,11 @@
 // @deno-types="npm:@types/nodemailer"
 import nodemailer from 'nodemailer'
-// import smime from 'nodemailer-smime'
 
 const dkimPrivateKey = await Deno.readTextFile(
 	'/home/julien/dkim_sendmail_keys/dkim_sendmail_cohabit_fr.pem',
-)
-
-// const smimeOptions = {
-// 	cert: '',
-// 	chain: [''],
-// 	key: '',
-// }
+).catch((cause) => {
+	throw new Error('unable to load DKIM private key', { cause })
+})
 
 export const transporter = nodemailer.createTransport({
 	sendmail: true,
@@ -22,4 +17,3 @@ export const transporter = nodemailer.createTransport({
 		privateKey: dkimPrivateKey,
 	},
 })
-// .use('stream', smime(smimeOptions))