Threat actors are using phishing emails with blank SMTP sender fields to bypass Microsoft 365 security filters, according to researchers at ReliaQuest. Attackers can therefore exploit this technique to impersonate internal users.
Threat actors are using phishing emails with blank SMTP sender fields to bypass Microsoft 365 security filters, according to researchers at ReliaQuest.
Attackers can therefore exploit this technique to impersonate internal users.
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Threat actors are using phishing emails with blank SMTP sender fields to bypass Microsoft 365 security filters, according to researchers at ReliaQuest. Attackers can therefore exploit this technique to impersonate internal users.
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