QNAP NAS email notifications stop working after Microsoft 365 disables Basic auth

Cause: QNAP's own forum confirms QNAP NAS notification settings do not support OAuth for Microsoft 365 SMTP — only username/password (Basic auth). When Exchange Online disables Basic auth for SMTP AUTH (default change at end of December 2026, per Microsoft's timeline), QNAP notification emails (storage alerts, backup job results, RAID degradation) go silent — and this is the kind of failure nobody notices until the hardware is already failing.

Fix without waiting on QNAP/Microsoft: point the NAS's notification SMTP settings at a relay that still accepts plain username/password. ZeroSMTP is a free one built for exactly this: server mx.msgwing.com, port 587 (STARTTLS) or 465 (SSL/TLS), your @msgwing.com credentials. Mail sends from that shared address, not your own domain — fine for device alerts, not for anything customer-facing.

Full guide: https://docs.msgwing.com/AFFECTED-SYSTEMS.html (what else silently breaks) and https://docs.msgwing.com/EXCHANGE-ONLINE-SMTP-AUTH.html