PowerShell

Send an SMTP NOOP Command

Demonstrates the Chilkat MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server. NOOP does nothing except elicit a positive response, which is useful for keeping a connection alive or verifying it is still responsive. This example opens an SMTP connection, sends a NOOP, and closes.

Background: When holding an SMTP connection open across many sends (see OpenSmtpConnection), an idle stretch can cause the server to time out and drop the socket. A periodic NOOP keeps the session active and confirms the server is still responding, so the next SendEmail doesn't fail on a silently-closed connection.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  Demonstrates the MailMan.SmtpNoop method, which sends an SMTP NOOP command to the server.
#  NOOP does nothing except elicit a positive response, useful for keeping a connection
#  alive or verifying it is still responsive.

$mailman = New-Object Chilkat.MailMan

#  Configure the SMTP server connection.
$mailman.SmtpHost = "smtp.example.com"
$mailman.SmtpPort = 465
$mailman.SmtpSsl = $true
$mailman.SmtpUsername = "user@example.com"
$mailman.SmtpPassword = "myPassword"

#  Open the SMTP connection.

$success = $mailman.OpenSmtpConnection()
if ($success -eq $false) {
    $($mailman.LastErrorText)
    exit
}

#  Send a NOOP to keep the connection alive.
$success = $mailman.SmtpNoop()
if ($success -eq $false) {
    $($mailman.LastErrorText)
    exit
}

$success = $mailman.CloseSmtpConnection()
if ($success -eq $false) {
    $($mailman.LastErrorText)
    exit
}

$("SMTP NOOP succeeded.")