Send email by powershell script is working on server 2019,but show error on windows server 2016

Occasional Contributor

$username = "Email address removed"
$password = "aaaaaabbbbb"
$sstr = ConvertTo-SecureString -string $password -AsPlainText -Force
$cred = New-Object System.Management.Automation.PSCredential -argumentlist $username, $sstr
$body = "This is a test email"
Send-MailMessage -To "Email address removed" -From "Email address removed" -Subject 'Test message' -Body $body -BodyAsHtml -SmtpServer -UseSSL -Credential $cred -Port 587


Run this PS script that send email from server , if running on windows server 2019 ,it's fine.

but show error on windows server 2016.

anyone know it?



Send-MailMessage : Unable to read data from the transport connection: net_io_connectionclosed.
At E:\test\test.ps1:6 char:1
+ Send-MailMessage -To "Email address removed" -From "Email address removed ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (System.Net.Mail.SmtpClient:SmtpClient) [Send-MailMessage], SmtpException
+ FullyQualifiedErrorId : SmtpException,Microsoft.PowerShell.Commands.SendMailMessage


4 Replies
My first guess would be TLS settings, could you try using [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 before the send-mailmessage?
best response confirmed by silverlu1210 (Occasional Contributor)
Thanks guy, Issue resolved. It means TLS should use 1.2 right?
Yes, you can put in in your scripts running on server 2016 or change the server settings to enable it by default Please mark my answer as solution to mark it as solved