Smtp Relay Checker Free and open source relay scanner.
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Smtp Relay Checker Description

Free and open source relay scanner. SmtpRC is multithreaded, so it is able to scan vast networks quickly, fully configurable, and it can output results in different formats for viewing. It is intended for Systems Administrators to scan IP blocks under their control.SmtpRC works by connecting to a mailserver, running through a series of pre-configured open relay tests and attemtping to relay mail through each server it checks. When finished scanning, it will check the mailbox specified for any relayed emails. What's New in This Release: · Fixes a race condition between the master and reaper thread.

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