Microsoft has confirmed a known issue that prevents recipients from opening encrypted emails in classic Outlook.

Threat actors are exploiting complex routing scenarios and misconfigured spoof protections to send spoofed phishing emails, ...

Attackers exploit misconfigured email routing and weak spoof protections to send internal-looking phishing emails for ...

Threat actors are abusing misconfigured MX records and weak DMARC/SPF policies to make phishing emails look internal, ...