(PowerShell) Send Email to Distribution List

Sends the same email to a list of 1000 email addresses in 50 sends where each email has 20 recipients.

Note: Chilkat is not intended nor designed for mass emailing. A solution such as this might be used for a corporate emailing to employees, or an emailing to newsletter subscribers.

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$mailman = New-Object Chilkat.MailMan

$mailman.SmtpHost = "smtp.mymailserver.com"
$mailman.SmtpPort = 465
$mailman.SmtpSsl = $true
$mailman.SmtpUsername = "myUsername"
$mailman.SmtpPassword = "myPassword"

# Create a new email object
$email = New-Object Chilkat.Email
$email.Subject = "This is a test"
$email.Body = "This is a test"
$email.From = "Senders Name <sender@example.com>"
$email.AddTo("Subscribers","subscribers@example.com")

$bdMime = New-Object Chilkat.BinData
$mailman.RenderToMimeBd($email,$bdMime)

# Load a file containing one email address per line.
$distList = New-Object Chilkat.StringTable
$success = $distList.AppendFromFile(1000,"utf-8","qa_data/distList.txt")
if ($success -eq $false) {
    $($distList.LastErrorText)
    exit
}

$sbRecipients = New-Object Chilkat.StringBuilder

$i = 0
$szDistList = $distList.Count
$j = 0
while ($i -lt $szDistList) {

    # Build a list of comma-separated recipients.
    if ($j -gt 0) {
        $sbRecipients.Append(",")
    }

    $sbRecipients.Append($distList.StringAt($i))

    $i = $i + 1
    $j = $j + 1

    # If we have 20 recipients, or we have the final recipient in the final chunk, then send.
    if (($j -eq 20) -or ($i -eq $szDistList)) {
        $success = $mailman.SendMimeBd("sender@example.com",$sbRecipients.GetAsString(),$bdMime)
        if ($success -ne $true) {
            $($mailman.LastErrorText)
            exit
        }

        $j = 0
        $sbRecipients.Clear()
    }

}

$success = $mailman.CloseSmtpConnection()
if ($success -ne $true) {
    $("Connection to SMTP server not closed cleanly.")
}

$("Email sent to distirbution list.")