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6.5 — HIGH

Microsoft Outlook leaves email connections unencrypted despite SSL/TLS setting

📅 5 June 2026 at 13:49 UTC📰 Cyber InsiderView original source ↗
Microsoft Outlook leaves email connections unencrypted despite SSL/TLS setting

A server upgrade that introduced stricter email security checks has uncovered what appears to be a long-standing Outlook issue that may have caused some users to retrieve email over unencrypted connections despite having SSL/TLS enabled in their account settings. The discovery was reported by German system administrator Marius Schwarz after upgrading mail servers from Fedora … The post Microsoft Outlook leaves email connections unencrypted despite SSL/TLS setting appeared first on CyberInsider.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

A long-standing Outlook issue has been uncovered, where users may have retrieved email over unencrypted connections despite having SSL/TLS enabled in their account settings.

⚙️Technical Details
Affected Systems
Outlook clientsDovecot 2.4.3
Attack Vectors
POP3 port 110
💥Impact Assessment
Severity: high
Who Is at Risk
Users of affected Outlook installations, including organizations subject to regulatory requirements
🛡️Recommended Actions
1Verify that POP3 accounts use port 995 with SSL/TLS
2Check server logs for TLS negotiation confirmation
3Update Dovecot configuration to block cleartext authentication over unsecured connections by default
📦Affected Products
Outlook clientsDovecot 2.4.3

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