PowerShell

Open a Persistent SMTP Connection

Demonstrates the Chilkat MailMan.OpenSmtpConnection method, which explicitly opens a connection to the SMTP server and authenticates if a username and password, OAuth2 token, or other applicable settings have been provided. This example opens the connection, notes where sending would occur, and closes it.

Background: By default, sending a single email opens a connection, sends, and closes it. When sending many messages, that per-message overhead adds up. Explicitly calling OpenSmtpConnection once, sending in a loop, then CloseSmtpConnection keeps a single authenticated session open for the whole batch — substantially faster and gentler on the server than reconnecting each time.

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

$success = $false

#  Demonstrates the MailMan.OpenSmtpConnection method, which explicitly opens a connection
#  to the SMTP server and authenticates if credentials (or an OAuth2 token) have been
#  provided.

$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"

#  Explicitly open (and authenticate) the SMTP connection.

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

$("SMTP connection opened.")

#  ... send one or more emails here ...

#  Close the connection when done.
$success = $mailman.CloseSmtpConnection()
if ($success -eq $false) {
    $($mailman.LastErrorText)
    exit
}