How to use Power-Shell to Perform SMTP Relay Test

In most cases, when application owner claiming, e-mails aren’t relayed through the existing internal application relay front end, you will need to perform few basic troubleshooting steps. Bear in mind asking basic questions up front will make your job easier.

What is the IP address of your application?

What platform your application is running from? (In this scenario we will assume the application is installed

on Windows Serer.

What is the host name ( FQDN) or IP address your application is configured to relay through

Do you have any logs on your application showing SMTP handshake (you are asking TCP/IP handshake).

Most   cases you won’t get this detailed information

If telnet service is installed you can sent e-mail from command line and observe the response. If SMTP relay

Front end accepting e-mails, you will need to figure it out what is happening on the transport and delivery

layers.

Here is simple PS code can be used to simplify the test from Application Server. You will need to change few variables to make this cod work in your environment

$smtpServer = "relay.smtp25.org"

$smtpFrom   = "smtp_relay@.smtp25.org "

$smtpTo     = "casey.dedeal@.smtp25.org "

clear-host #()Variables $subject    = "Testing SMTP Relay" $body       = "smtp relay testing" $smtpServer = "relay.smtp25.org" $smtpFrom   = "smtp_relay@.smtp25.org " $smtpTo     = "casey.dedeal@.smtp25.org " #()Message $Computer = $env:computername $message  = " sent from " #()Subject body $messageSubject = $subject $messageBody = $body + $message + $Computer #()Sending $smtp = New-Object Net.Mail.SmtpClient($smtpServer) $smtp.Send($smtpFrom,$smtpTo,$messagesubject,$messagebody)

Oz Casey, Dedeal
Systems Engineer
http://smtp25.blogspot.com/ (Blog)
http://telnet25.wordpress.com/ (Blog)
https://twitter.com/Message_Talk (Twitter)

PowerShell Check if Server is alive

Use the script below to check if a server is alive # replace the server name to make it fit into your needs.

$server = “dc1.smtp25.org” If (Test-Connection $server -count 1 -quiet) {   Write-host  “The $server responded” -f yellow } else{ Write-host  “No connection to $server” -f red   Write-host “Script will stop” -f red    Break }

Oz Casey, Dedeal
Systems Engineer
http://smtp25.blogspot.com/ (Blog)
http://telnet25.wordpress.com/ (Blog)
https://twitter.com/Message_Talk (Twitter)

Using PowerShell Test-Connection

#(1)_.Check if  Machine is responding Clear-host Write-host $null #(a)_Capture Server name $server = Read-host “_Provide Server Name to Test” #(b)_. Test Connection If (Test-Connection $server -count 1 -quiet) {   Write-host "The $server responded" -f yellow } else{ Write-host  "No connection to $server" -f red   Write-host "Script will stop" -f red    Break; }

Oz Casey, Dedeal
Systems Engineer
http://smtp25.blogspot.com/ (Blog)
http://telnet25.wordpress.com/ (Blog)
https://twitter.com/Message_Talk (Twitter)

Connect Remote Exchange Server Function

You can use below function to make connection to remote PS in Exchange 2016.

You will need to change following string $server ="EXC01.smtp25.org" to make it work for you environment.

# Connect Remote PS Exchange 2016 Server, Specify Server to connect.

# Change the server FQDN with server name you desire. Function Connect_E16 {     param(         [Parameter( Mandatory=$false)]         [string]$server ="EXC01.smtp25.org" )         $session = New-PSSession -ConfigurationName Microsoft.Exchange `         -ConnectionUri http://$srv/PowerShell/ `         -Authentication Kerberos          Import-PSSession $session -AllowClobber } Clear-host write-host $null Write-host "_Connecting Exchange 2016 Servers" $Connect_E16

Oz Casey, Dedeal
Systems Engineer
http://smtp25.blogspot.com/ (Blog)
http://telnet25.wordpress.com/ (Blog)
https://twitter.com/Message_Talk (Twitter)