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Phishing Emails

We have been suffering with Phishing emails from last 3 months...The attacker using internal domain user address and sending the phishing emails to all domain users...The Rackspace team is not able to understand how the attacker using the internal users address as proxy...Configured the SPF, DMARC and DKIM records... in spite of that we are seriously impacting with phishing attacks...Any solutions?...

Ashok M