SpamJadoo

Spamjadoo: Spam Rejected at the SMTP Handshake, Never in the InboxSpamjadoo refuses spam during the SMTP session, before a byte of content is accepted. Protocol-level defense for ISPs, hosts and enterprises.Spamjadoo is an anti-spam SMTP gateway from Data Xgen Technologies Pvt Ltd (India). It rejects spam during the SMTP session, with a 550 at RCPT TO before the DATA command, instead of accepting, scanning and then filtering the message. It targets ISPs, hosting providers, enterprises, MSPs and government. It's the engine behind their own XgenPlus mail server, and they say it's the official antispam gateway for the Government of Rajasthan.