Mimecast incident

Outbound delivery delays on AU grid

Resolved after 10 hours 15 minutes, affecting Australian Grid and Offshore Grid (Offshore Grid — Email Processing), on July 27, 2026.

monitoring Jul 27, 2026, 07:28 AM UTC

We have applied mitigation steps to resolve the issue causing outbound MX lookup errors for a subset of AU-hosted customers. Some outbound mail may still be delayed while the backlog clears. We're monitoring closely to confirm full recovery and will provide further updates as they become available.

Started
Jul 27, 2026, 06:03 AM UTC
Resolved
Jul 27, 2026, 04:18 PM UTC
Duration
10h 15m
Detected by Pingoru
Jul 27, 2026, 06:03 AM UTC

Affected components

Australian GridOffshore Grid (Offshore Grid — Email Processing)

Update timeline

  1. investigating Jul 27, 2026, 06:03 AM UTC

    We are aware that some customers on our AU grid may be experiencing outbound mail delivery delays due to MX lookup errors, with messages held in the delivery queue. We are investigating and will post updates here as they become available.

  2. identified Jul 27, 2026, 06:40 AM UTC

    We have identified the issue causing outbound MX lookup errors for a subset of AU-hosted customers and are working on a resolution. We'll provide further updates as they become available.

  3. monitoring Jul 27, 2026, 07:28 AM UTC

    We have applied mitigation steps to resolve the issue causing outbound MX lookup errors for a subset of AU-hosted customers. Some outbound mail may still be delayed while the backlog clears. We're monitoring closely to confirm full recovery and will provide further updates as they become available.

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