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“Ghost-Sender" is the result of a widespread misconfiguration, according to researchers, and evidence indicates it's being actively abused in the wild.
Email at many organizations has stopped working; the tech giant has advised users who are facing the issue to uninstall the updates so that it can address flaw.
Attackers can spoof millions of email addresses to create targeted phishing attacks using flaws in Microsoft, GTX, and Cisco Secure Email Gateway servers.
Defenders have been left scrambling after the way patches were released for six flaws in the open source mail server, which is the most popular mail transfer agent on the Internet.
A flaw in unpatched Zimbra email servers could allow attackers to obtain remote code execution by pushing malicious files past filters.