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VRFY.EXE is Win 95/NT consol application 
It is based on SMTP VRFY command.
The VRFY command is mentioned in the RFC documents.
But some SMTP servers  block this command.
Some SMTP servers  return result with user name - some without.

Example 1

To run if from virtual DOS using this DOS command line:

vrfy helen@zr.ru

Result of execution:

This program tries to verify if E-mail user exists
Consol application Win NT/95
Program based on Internet SMTP protocol, a result depends on Internet provider.

Program is free for distribution. Alex Ermolaev. 1977 Canada

Your Local Host Name:
Your Local Host Address:
Remote Local Host Name: zr.ru
Remote Local Host Address: 194.186.162.223

SMTP/ Reply from remote Host:
220 .............

HELO I am ...
Reply from remote Host:
250 ..........

Result of user definition: 250 Elena Dergunova <helen@bsd2.zr.ru>

Example 2

To run if from virtual DOS using this DOS command line:

vrfy hel@zr.ru

Result of execution:

This program tries to verify if E-mail user exists
Consol application Win NT/95
Program based on Internet SMTP protocol, a result depends on Internet provider.

Program is free for distribution. Alex Ermolaev. 1977 Canada

Your Local Host Name:
Your Local Host Address:
Remote Local Host Name: zr.ru
Remote Local Host Address: 194.186.162.223

SMTP/ Reply from remote Host:
220 .............

HELO I am ...
Reply from remote Host:
250 ..........

Result of user definition: 550 ... user unknow