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ChangedUpdateidentified#1
Before: …Start: 2026-11-12 ~18:45 UTC (19:45 CET) - Impact: Email delivery to Microsoft consumer domains significantly delayed. Backlog of ~2,500 emails pending (incl. short-TTL OTP/auth messages at risk of expiry drops). All sending pools affected; partial delivery continues (8/min vs 25–30/min nominal). - Symptoms / findings: TCP connection timeouts (SYN unanswered) to Microsoft MX endpoints (52.101.x.x), spread across 10+ sending IPs and all pools. No connection refusals, no SMTP-level throttling — behavior consistent with a Microsoft-side infrastructure degradation, not reputation filtering. Deferrals peaked at ~1,000 MX-unavailable events / 10 min. No other destination domains affected beyond Microsoft consumer properties (+ unrelated, pre-existing Proximus/gtm-tc2 slowness tracked separately). - External cause: Microsoft 365 / Exchange Online outage, tracked by Microsoft as EX1550543 — acknowledged ~19:37 UTC, fix deployed ~18:30 CET, gradual recovery in progress. Refs: @MSFT365Status, Downdetector (outlook, microsoft-365). - Mitigation: None applicable (external provider). Emails retry automatically (1-min per-pool MX failure cache + per-email backoff); backlog expected to drain on Microsoft recovery. - Next steps: Continuo …
After: …Start: 2026-11-12 ~18:45 UTC (19:45 CET) Impact: Some emails can take up 1 hour to be delivered. Cause: External. Microsoft 365 / Exchange Online outage Mitigation: Continuous monitoring of MX timeouts
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[Transactional Email] - world - Delayed email delivery to Microsoft domains (Outlook/Hotmail)this change
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Incident silently edited: [Transactional Email] - world - Delayed email delivery to Microsoft domains (Outlook/Hotmail) on Scaleway’s status page, changed 2026-11-12 20:43 UTC (change 1 of 1).
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Incident silently edited: [Transactional Email] - world - Delayed email delivery to Microsoft domains (Outlook/Hotmail)