In PowerShell, is there a way to dispose of Send-MailMessage resources? - powershell

Question

I've written a PowerShell script that sends an email message. Originally I used the Send-MailMessage commandlet.
Send-MailMessage -SmtpServer $MailServer `
-To $MailTo `
-From $MailFrom `
-Subject $MailSubject `
-Body $MailBody
This is concise. But if I execute the script rapidly in succession on my workstation, the following error appears in the PowerShell console.
Unable to read data from the transport connection: An established
connection was aborted by the software in your host machine.
What I suspect is that resources aren't being released or that a thread is getting blocked. Below is my current workaround, which has the advantage of being disposable. And I can run this in rapid succession with no transport connection errors. But this is more verbose than Send-MailMessage.
[object]$SMTPClient = New-Object System.Net.Mail.SmtpClient
[object]$MailMessage = New-Object System.Net.Mail.MailMessage
$SMTPClient.Host = $MailServer
$MailMessage.To.Add($MailTo)
$MailMessage.From = $MailFrom
$MailMessage.Subject = $MailSubject
$MailMessage.Body = $MailBody
$SMTPClient.Send($MailMessage)
$MailMessage.Dispose()
$SMTPClient.Dispose()
Is there some way to force Send-MailMessage to release resources when I'm done with it, perhaps via Dispose or a C# style using statement? Thanks.

Answer 1

Frankly, "it works but it's verbose" shouldn't be a huge concern, especially when "verbose" means 10 lines. And I mean, you can simplify your syntax by using the class constructors:
$SMTPClient = New-Object -TypeName System.Net.Mail.SmtpClient -ArgumentList $MailServer
$MailMessage = New-Object -TypeName System.Net.Mail.MailMessage -ArgumentList $MailFrom, $MailTo, $MailSubject, $MailBody
$SMTPClient.Send($MailMessage)
$MailMessage.Dispose()
$SMTPClient.Dispose()

Answer 2

Based on the comment, you could be overflowing whatever buffer there is for the cmdlet. This answer is more a point on style for the future (less chance of mistakes happening) by using splatting:
$MailMessage = #{
SmtpServer = $MailServer;
To = $MailTo;
From = $MailFrom;
Subject = $MailSubject;
Body = $MailBody;
}
Send-MailMessage #MailMessage
Edit-
This can also be done with the selected answer:
$Client = #{
TypeName = 'System.Net.Mail.SmtpClient';
ArgumentList = $MailServer;
}
$Message = #{
TypeName = 'System.Net.Mail.MailMessage';
ArgumentList = #($MailFrom,$MailTo,$MailSubject,$MailBody);
}
$SMTPClient = New-Object #Client
$MailMessage = New-Object #Message