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Phishers Exploit Google’s SMTP Relay Service to Deliver Spoofed Emails

Phishers are exploiting a flaw in Google’s SMTP relay service to send malicious emails spoofing popular brands. Avanan researcher Jeremy Fuchs says that starting in April 2022, they have seen a massive uptick of these SMTP relay service exploit attacks in the wild, as threat actors use this service to spoof other Gmail tenants.