eSAV is an email sender address verification console utility for Linux/FreeBSD. It opens an SMTP connection to the sender's mail server and emulates an error return message to the sender without actually completing the transaction. It's an easy way to check if an email address is alive. License: GNU General Public License v3 Changes: Incorrect handling of received SMTP packets via some Cisco routers was fixed. The license ws switched to the GPLv3.

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