Microsoft warns of a surge in phishing attacks exploiting ...

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1. “Internal” routing and weak policies are at fault “When MX records lead to complex mail paths, such as on-premises systems or third-party relays before Microsoft 365, standard spoof protection checks like SPF hard-fail and strict DMARC enforcement may not be applied correctly.” In these cases, a phishing email can arrive with the recipient’s own address in both the “To” and “From” fields, a spoofed message that appears internal at a glance. In some cases, attackers change the sender name to make the message appear more convincing, while the “From” field is set to a valid internal email address.

   In Third-party sender authentication

2. “Internal” routing and weak policies are at fault “The fault is with how receiving mail servers interpret incoming messages.” In these cases, a phishing email can arrive with the recipient’s own address in both the “To” and “From” fields, a spoofed message that appears internal at a glance. In some cases, attackers change the sender name to make the message appear more convincing, while the “From” field is set to a valid internal email address.

   In Inbox placement and spam filters

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