SMTP VRFY --request # Server-side 250 %LTrecipient@example.com%GT # Client-side smtp SMTP VRFY with custom request # the custom request just does it lowercase to remain the same command smtp://%HOSTIP:%SMTPPORT/%TESTNUMBER --mail-rcpt recipient --request "vrfy" # Verify data after the test has been "shot" EHLO %TESTNUMBER vrfy recipient QUIT