The fix has been deployed and verified against live traffic. Email sending is working normally for all affected accounts. We're continuing to monitor closely over the next 24 hours to confirm full stability.

We identified the cause: an automated security rule was incorrectly flagging a small number of legitimate outgoing emails as suspicious and blocking them. We deployed a targeted fix and began verifying it.

We received reports of email sending failures for some customers, with an error shown when attempting to send. Our team began investigating immediately.