I use this to see if the clients ISP is blocking port 25 (smtp traffic). You will have to change SMTPSERVER.COM to a server you know accepts SMTP traffic. You will also need to remove the space after the @ symbol and try to use a known account. Either way it probably won't finish, but as long as you receive something other than this "Connecting To SMTPSERVER.COM...Could not open connection to the host, on port 25: Connect failed" back it is probably open.
@echo off
rem ---------------------------
rem - Port 25 Test -
rem ---------------------------
echo Testing Port 25:
telnet SMTPSERVER.COM 25
EHLO SMTPSERVER.COM
MAIL FROM: TEST@ SMTPSERVER.COM
RCPT TO: TESTER@ SMTPSERVER.COM
DATA
Subject: Test
This is a test message you will not see a response from this command.
.
QUIT
echo --------------------------------------------
exit
You cannot pass text into a telnet session from a batch/cmd file
The only command necessary for your test:
telnet SMTPSERVER.COM 25
You will never be able to actually send a test email using this script.
