PowerShell

Attach an Email to Another Email

Demonstrates the Chilkat Email.AttachEmail method, which attaches a copy of another email to this email object. The attached email is encapsulated in a message/rfc822 subpart. Because a copy is attached, later changes to the source email do not affect the embedded message. This example attaches one email to another.

Background: "Forward as attachment" produces exactly this structure: the original message is embedded whole as a message/rfc822 part rather than quoted into the body. This preserves the original's headers and formatting intact, which matters for forwarding to a mailbox that will re-parse it, or for reporting spam/phishing with the original evidence attached. Such parts are counted by NumAttachedMessages.

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

$success = $false

#  Demonstrates the AttachEmail method, which attaches a copy of another email to this email
#  object.  The attached email is encapsulated in a message/rfc822 subpart.

$innerEmail = New-Object Chilkat.Email
$innerEmail.Subject = "Original message"
$innerEmail.From = "alice@example.com"
$innerEmail.Body = "This is the original message being forwarded."

$email = New-Object Chilkat.Email
$email.Subject = "FW: Original message"
$email.From = "bob@example.com"
$email.Body = "See the attached original email."

#  Attach a copy of the inner email as a message/rfc822 part.

$success = $email.AttachEmail($innerEmail)
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

$("NumAttachedMessages = " + $email.NumAttachedMessages)