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This morning I was told about a method which can be used to verify a mailing address.
Not all mail servers will accept this command as it can be disabled. This method
make use of the SMTP (Simple Mail Transport Protocol) command VRFY (VeRiFY). In the
following example, we connect to port 25 (smtp). What I typed is highlighted in
bold.
This example shows that the user mike exists but the user xyz doesn't.
$ telnet somedomain.com smtp
Trying aa.bb.cc.dd...
Connected to somedomain.com.
Escape character is '^]'.
220 somedomain.com ESMTP Sendmail 8.9.3/8.9.3;
Fri, 30 Apr 1999 15:00:14 -0700 (PDT)
VRFY mike
250 Mike Hoskings <mike@somedomain.com>
VRFY xyz
550 xyz... User unknown
^]
telnet> quit
Connection closed.
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