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Affected version: XenForo 2.3.12 (bundled symfony/mailer v5.4.52), PHP 8.3.33, nginx/Centminmod on AlmaLinux 9. Email transport: SMTP, smtp.gmail.com:465 (SSL), Google OAuth configured via the ACP "Set up OAuth" flow (Google Workspace account, Internal audience).
Summary
Starting 2026-09-29, every outbound email through gmail oauth smtp fails with:
Code:
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Summary
Starting 2026-09-29, every outbound email through gmail oauth smtp fails with:
Code:
Code:
Symfony\Component\Mailer\Exception\TransportException: Email to <recipient> from <sender> failed:
Failed to authenticate on...Read more
Continue reading...