PowerShell

Convert a MIME Entity to multipart/mixed

Demonstrates the Chilkat Mime.ConvertToMultipartMixed method, which wraps the current entity in a new outer multipart/mixed, making the original the first child. It takes no arguments.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you turn an existing single-part message into one that can hold attachments — rather than rebuilding it, you wrap it, and its content becomes the first child of a new multipart/mixed. Message-level and custom headers are carried onto the new outer entity so the message identity is preserved. Afterward, AppendPartFromFile adds attachments beside the original body.

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

$success = $false

$mime = New-Object Chilkat.Mime
$success = $mime.LoadMimeFile("qa_data/message.eml")
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

#  Wrap the current entity in a new outer multipart/mixed entity.  The original entity becomes the
#  first child, which is what you do to add attachments to an existing single-part message.
$success = $mime.ConvertToMultipartMixed()
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

#  Now attachments can be appended alongside the original content.
$success = $mime.AppendPartFromFile("qa_data/report.pdf")
if ($success -eq $false) {
    $($mime.LastErrorText)
    exit
}

$("Number of parts: " + $mime.NumParts)