PowerShell

Count the Messages in a multipart/digest Email

Demonstrates the read-only Chilkat Email.NumDigests property, which is the number of message/rfc822 parts contained within a multipart/digest enclosure. If no such enclosure exists, the value is 0. Digest indexes are zero-based; use GetDigestEmail to retrieve an individual bundled message as its own Email object. This example loads a digest email and lists each message's subject.

Background: A multipart/digest is a way to package many separate emails inside one carrier message — historically used by mailing lists to send a single daily "digest" containing all of that day's posts. Each bundled item is a complete message/rfc822 email with its own headers and body. This differs from NumAttachedMessages, which counts nested messages attached to an ordinary email rather than the members of a digest enclosure.

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

$success = $false

#  Demonstrates the read-only Email.NumDigests property, which is the number of
#  message/rfc822 parts contained within a multipart/digest enclosure.  If there is no
#  multipart/digest enclosure, the value is 0.  Digest indexes are zero-based.

$email = New-Object Chilkat.Email

#  Load a multipart/digest email (a single email that bundles many messages).
$success = $email.LoadEml("qa_data/eml/digest.eml")
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

$n = $email.NumDigests
$("NumDigests = " + $n)

#  Retrieve each bundled message as its own Email object.
$digestEmail = New-Object Chilkat.Email

for ($i = 0; $i -le $n - 1; $i++) {
    $success = $email.GetDigestEmail($i,$digestEmail)
    $("Digest " + $i + " subject: " + $digestEmail.Subject)
}

#  Note: Paths such as "qa_data/..." are relative local filesystem paths,
#  relative to the current working directory of the running application.