INKY incident

Issues delivering emails to Microsoft Groups/DLs with Empty From Headers

Minor Resolved View vendor source →

INKY experienced a minor incident on July 23, 2025 affecting Office 365, lasting 1h 33m. The incident has been resolved; the full update timeline is below.

Started
Jul 23, 2025, 03:17 PM UTC
Resolved
Jul 23, 2025, 04:51 PM UTC
Duration
1h 33m
Detected by Pingoru
Jul 23, 2025, 03:17 PM UTC

Affected components

Office 365

Update timeline

  1. identified Jul 23, 2025, 03:17 PM UTC

    We have identified an issue sending email to Microsoft Groups/Distribution Lists with Empty From Headers. Typically, this would only be older groups in a tenant with this configuration and a patch is being put together to handle these correctly.

  2. resolved Jul 23, 2025, 04:51 PM UTC

    Update has been made to correctly handle and deliver the emails to groups with an empty From header.