(PowerShell) Process Large POP3 Mailbox

Demonstrates how to read email from a mailbox that may contain a large number of emails.

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.

$mailman = New-Object Chilkat.MailMan

$mailman.MailHost = "pop.example.com"

$mailman.PopUsername = "myLogin"
$mailman.PopPassword = "myPassword"

$mailman.MailPort = 995
$mailman.PopSsl = $true

# Get the list of UIDLs for all emails in the mailbox.
$sa = $mailman.GetUidls()
if ($mailman.LastMethodSuccess -eq $false) {
    $($mailman.LastErrorText)
    exit
}

$numEmails = $sa.Count
if ($numEmails -eq 0) {
    $("Mailbox is empty")
    exit
}

$chunkSize = 6

# Download the emails in chunks of 6 emails each.
$chunkBeginIdx = 0
$chunkEndIdx = $chunkSize - 1
if ($chunkEndIdx -ge $numEmails) {
    $chunkEndIdx = $numEmails - 1
}

$saChunk = New-Object Chilkat.StringArray
while (($chunkBeginIdx -lt $numEmails)) {

    $([string]$chunkBeginIdx + " to " + $chunkEndIdx)

    # Build a chunk of UIDLs.
    $saChunk.Clear()
    for ($i = $chunkBeginIdx; $i -le $chunkEndIdx; $i++) {
        $saChunk.Append($sa.GetString($i))
    }

    # Log the UIDLs in this chunk...
    $chunkStr = $saChunk.SaveToText()
    $($chunkStr)

    # Download this chunk of email from the POP3 server.
    $bundle = $mailman.FetchMultiple($saChunk)
    if ($mailman.LastMethodSuccess -eq $false) {
        $($mailman.LastErrorText)
        exit
    }

    $("Downloaded " + $bundle.MessageCount + " emails.")
    $("----")

    # Process the bundle...
    # (your application's processing code goes here...)

    # Get the next chunk...
    $chunkBeginIdx = $chunkBeginIdx + $chunkSize
    $chunkEndIdx = $chunkEndIdx + $chunkSize
    if ($chunkEndIdx -ge $numEmails) {
        $chunkEndIdx = $numEmails - 1
    }

}