RFE - Deploy Google RETVec Antispam Technology Into Zimbra

Google has open sourced an anti-spam technology that blocks Spam which uses ASCII lookalike characters to defeat typical SpamAssassin lookup tests.

Google have been using this tech successfully in Gmail, and have found it incredibly effective.

Although it won’t replace blocklists, I can certainly see that it would eliminate a lot of new spam during that several-hour-window from when new spam is sent out broadly, but before the Spamhaus etc. honeypots pick it up and add it to their own lookups so we can block it.

Please consider adding this “Zimbra Magic” feature into the Zimbra MTA codebase.

Thanks!

References:
https://arstechnica.com/gadgets/2023/12/gmails-ai-powered-spam-detection-is-its-biggest-security-upgrade-in-years/
https://security.googleblog.com/2023/11/improving-text-classification.html
https://github.com/google-research/retvec