From bd9495f284d0a80b24a8a9e5c05d9084507e8ac9 Mon Sep 17 00:00:00 2001
From: Patryk Bajer <patryk.bajer@gmail.com>
Date: Mon, 22 Jun 2026 16:58:35 +0200
Subject: [PATCH] fix: use Nodemailer's native OAuth2 auth for SMTP

The raw xoauth2 field is not recognized by Nodemailer. Switch to
type: 'OAuth2' + accessToken which Nodemailer handles natively.
---
 src/channels/email/smtp-imap/SmtpImapConnection.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/channels/email/smtp-imap/SmtpImapConnection.ts b/src/channels/email/smtp-imap/SmtpImapConnection.ts
index 2d23557..dc32a0d 100644
--- a/src/channels/email/smtp-imap/SmtpImapConnection.ts
+++ b/src/channels/email/smtp-imap/SmtpImapConnection.ts
@@ -52,8 +52,9 @@ export class SmtpImapConnection extends EmailConnectionBase {
       secure: this.smtpSecure,
       auth: this.oauth2AccessToken
         ? {
+            type: 'OAuth2',
             user: this.smtpAuthUser,
-            xoauth2: Buffer.from(`user=${this.smtpAuthUser}\x01auth=Bearer ${this.oauth2AccessToken}\x01\x01`, 'utf-8').toString('base64'),
+            accessToken: this.oauth2AccessToken,
           }
         : {
             user: this.smtpAuthUser,