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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.
Misconfigurations abused to make phishing emails look like they come from within the organization
Threat actors engaging in phishing attacks are exploiting routing scenarios and misconfigured spoof protections to impersonate organizations' domains and distribute emails that appear as if they have been sent internally
Pen-tester accessed more than 650,000 sensitive messages, and still can, at Indian outfit using Toyota SaaS Toyota Tsusho Insurance Broker India (TTIBI), an Indo-Japanese joint insurance venture, operated a misconfigured server that exposed more than 650,000 Microsoft-hosted email messages to customers, a security researcher has found.…
Hotmail users worldwide have problems sending emails, with messages flagged as spam or not delivered after Microsoft misconfigured the domain's DNS SPF record. [...]