MEDIUMVulnerability
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Microsoft links Classic Outlook issue to email delivery problems

Thursday, April 2, 2026 at 09:12 AM UTC·Source: BleepingComputer

Updated: Thursday, April 2, 2026 at 04:49 PM UTC

Executive Summary

Microsoft is investigating a known issue that prevents some Classic Outlook users from sending emails via Outlook.com. [...]

Analysis

Microsoft is investigating a known issue that prevents some Classic Outlook users from sending emails via Outlook.com. [...]

Indicators of Compromise (1)

Domain (1)
Outlook.com
VirusTotalURLhaus
Source Attribution

Originally published by BleepingComputer on Apr 2, 2026.

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