Gmail to Drop Support for 3DES Encryption in SMTP Connections
2025-05-08
Google announced that it will stop supporting the Triple Data Encryption Standard (3DES) for incoming SMTP connections starting May 30, 2025. After this date, email systems using 3DES will be unable to deliver emails to Gmail accounts. This change improves security by mitigating vulnerabilities associated with outdated encryption. All sending systems should be configured to use modern, secure TLS ciphers. See the Gmail Help Center for details.
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3DES Encryption