(PowerShell) Bounced Email Handling

Demonstrates how to examine emails and detect which are bounced (automated) replies. Classifies each email according to the type of bounce.

Chilkat .NET Downloads Chilkat .NET Assemblies

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.

$bounce = New-Object Chilkat.Bounce

# The mailman object is used for receiving (POP3) 
# and sending (SMTP) email.
$mailman = New-Object Chilkat.MailMan

# Set the POP3 server's hostname
$mailman.MailHost = "mail.chilkatsoft.com"

# Set the POP3 login/password.
$mailman.PopUsername = "myLogin"
$mailman.PopPassword = "myPassword"

# Copy the all email from the user's POP3 mailbox 
# into a bundle object.  The email remains on the server.
# (There are other methods for deleting email from a POP3 server.)
$bundle = $mailman.CopyMail()
if ($mailman.LastMethodSuccess -eq $false) {
    $($mailman.LastErrorText)
    exit
}

$i = 0

while ($i -lt $bundle.MessageCount) {
    $email = $bundle.GetEmail($i)

    $success = $bounce.ExamineEmail($email)
    if ($success -eq $false) {
        $($bounce.LastErrorText)

        exit
    }

    if ($bounce.BounceType -eq 1) {
        # Hard bounce, log the email address
        $("Hard Bounce: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 2) {
        # Soft bounce, log the email address
        $("Soft Bounce: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 3) {
        # General bounce, no email address available.
        $("General Bounce: No email address")
    }

    if ($bounce.BounceType -eq 4) {
        # General bounce, log the email address
        $("General Bounce: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 5) {
        # Mail blocked, log the email address
        # A bounce occured because the sender was blocked. 
        $("Mail Blocked: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 6) {
        # Auto-reply, log the email address
        $("Auto-Reply: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 7) {
        # Transient (recoverable) Failure, log the email address
        $("Transient Failure: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 8) {
        # Subscribe request, log the email address
        $("Subscribe Request: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 9) {
        # Unsubscribe Request, log the email address
        $("Unsubscribe Request: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 10) {
        # Virus Notification, log the email address
        $("Virus Notification: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 11) {
        # Suspected bounce.
        # This should be rare.  It indicates that the Bounce
        # component found strong evidence that this is a bounced
        # email, but couldn't quite recognize everything it
        # needed to be 100% sure.  Feel free to notify
        # support@chilkatsoft.com regarding emails having this
        # bounce type.
        $("Suspected Bounce!")
    }

    if ($bounce.BounceType -eq 12) {
        # Challenge/Response - Auto-reply message sent by SPAM software 
        # where only verified email addresses are accepted. 
        $("Challenge: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 13) {
        # Address Change Notification Message.
        $("Address Change: " + $bounce.BounceAddress)
    }

    if ($bounce.BounceType -eq 14) {
        # Success DSN indicating that the message was successfully relayed.
        $("DSN Successful Relay: ")
    }

    $i = $i + 1
}

$success = $mailman.Pop3EndSession()