New-object : Exception calling ".ctor" with "2" argument(s): "A connection attempt failed because the connected party did not properly respond after a period of time, or establishedĬonnection failed because connected host has failed to respond 192.168.1.54:25"Īt C:\scripts\Test-SMTP-Telnet.ps1:29 char:11 PS C:\> PowerShell.exe -ExecutionPolicy Bypass C:\scripts\Test-SMTP-Telnet.ps1 -RemoteHost "" -Port "25" -From -To -Greet "HELO" The following error shows up if port 25 is not reachable. PS C:\> PowerShell.exe -ExecutionPolicy Bypass C:\scripts\Test-SMTP-Telnet.ps1 -RemoteHost "" -Port "25" -From -To -Greet "EHLO"Ģ20 Microsoft ESMTP MAIL Service ready at Sat, 18:56:22 +0100Ģ Hello Ģ21 2.0.0 Service closing transmission channel SMTP port 25 not reachable If you don’t see those response codes, check your SMTP configuration.
How to use telnet in a script code#
The response code 250 2.1.0 and 250 2.1.5 shows that the SMTP connection is good. PS C:\> PowerShell.exe -ExecutionPolicy Bypass C:\scripts\Test-SMTP-Telnet.ps1 -RemoteHost "" -Port "25" -From -To -Greet "HELO"Ģ20 Microsoft ESMTP MAIL Service ready at Sat, 18:55:32 +0100ĭo it again, but this time with EHLO. As you can see, there will be no response code 250 2.1.5 Recipient OK. The below output is what you get when it’s not working. PS C:\> PowerShell.exe -ExecutionPolicy Bypass C:\scripts\Test-SMTP-Telnet.ps1 -RemoteHost "" -Port "25" -From -To -Greet "HELO"Ģ20 Microsoft ESMTP MAIL Service ready at Sat, 18:52:54 +0100Ģ50 Hello Ģ21 2.0.0 Service closing transmission channel It looks great because the sender and recipient response codes are both OK. Start PowerShell on the system that is allowed to send an email. In this example, will resolve to one of the Exchange Servers IP addresses. Use the Exchange Server hostname, IP address, or the DNS record. If you only have one Exchange Server or DNS round-robin, you most likely have the A-record pointed to your Exchange Server. In the internal DNS, an A-record is set up for that will translate to the load balancer. Sign in on this server and run the Telnet PowerShell script. The AP01-2016 server is an application server that sends emails to internal and external recipients.
How to use telnet in a script windows#
It’s important to run the SMTP Telnet PowerShell script on the client itself and not on the Exchange Servers.įor example, you add the Windows Server AP01-2016 IP address 192.168.1.60 to the Exchange Server’s SMTP relay. You can enter a different port than port 25 and test the port that you like. In this example, we will test the anonymous SMTP relay with port 25.
You like to know that SMTP works, and you need to test the SMTP connection. Write-host -foregroundcolor yellow "Subject : $Subject"Īfter preparing the SMTP PowerShell script, you will test the SMTP connection with EHLO, and HELO commands. Write-host -foregroundcolor yellow $command Write-host -foregroundcolor yellow "MAIL FROM: $from" Write-host -foregroundcolor yellow $Greet $writer = new-object System.IO.StreamWriter($stream) $socket = new-object ($RemoteHost, $Port) Write-host -n -foregroundcolor cyan ($encoding.GetString($buffer, 0, $read)) $Port, # Choose port number 25 or any other $RemoteHost, # Exchange Server host name or IP address Create a script folder if you don’t have one. Give it the name Test-SMTP-Telnet.ps1 and place it in the C:\scripts folder. No antivirus or security products block SMTP connectionsĭownload the Test-SMTP-Telnet.ps1 PowerShell script or copy and paste the below code in Notepad.HELO SMTP command and sent an email to recipient.
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