In an effort to enhance email security and combat spam, Google recently implemented a new policy requiring bulk senders to authenticate their emails. As of February 2024, Gmail users began receiving error messages, specifically the Gmail 550-5.7.26 error, indicating that the sender's email lacked authentication.
The policy was announced by Neil Kumaran, a group product manager responsible for Gmail security and trust, in October 2023. Kumaran emphasized the importance of email authentication to close loopholes exploited by attackers. With over 1.8 billion Gmail accounts, this policy aims to protect all users from potential threats.
