PowerShell

Zip an Email's Attachments into One File

Demonstrates the Chilkat Email.ZipAttachments method, which replaces all of an email's attachments with a single Zip file attachment having the specified filename. The original attachments are removed and packed into the Zip. This example adds two attachments and zips them into one.

Background: Bundling multiple attachments into a single .zip keeps a message tidy, compresses the payload, and works around recipients or gateways that limit the number of attachments. Note that the filename here (files.zip) names the attachment inside the message — it is not a path on disk. The reverse operation is UnzipAttachments.

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

$success = $false

#  Demonstrates the ZipAttachments method, which replaces all of an email's attachments
#  with a single Zip file attachment having the specified filename.  The original
#  attachments are removed and packed into the Zip.

$email = New-Object Chilkat.Email
$email.Subject = "Zip the attachments"

$email.AddStringAttachment("a.txt","first attachment")
$email.AddStringAttachment("b.txt","second attachment")
$("NumAttachments before = " + $email.NumAttachments)

#  Replace all attachments with a single Zip attachment named "files.zip".
$success = $email.ZipAttachments("files.zip")
if ($success -eq $false) {
    $($email.LastErrorText)
    exit
}

$("NumAttachments after = " + $email.NumAttachments)