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Get the Size of a POP3 Message by UIDL

Demonstrates the Chilkat MailMan.GetSizeByUidl method, which returns the size, in bytes, of the email on the POP3 server identified by a UIDL. The size includes the full message content, including attachments, and the method returns -1 on error. This example looks up a message's size by its UIDL.

Background: A UIDL ("unique ID listing") is POP3's stable identifier for a message — it stays the same across sessions as long as the message remains in the mailbox. Checking a message's size before downloading lets a client skip or defer very large messages, enforce size limits, or show a progress estimate. You can obtain the available UIDLs from GetMailboxInfoXml or FetchUidls.

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

#  Demonstrates the MailMan.GetSizeByUidl method, which returns the size, in bytes, of the
#  email on the POP3 server identified by a UIDL.  The size includes the full message
#  content, including attachments.  Returns -1 on error.

$mailman = New-Object Chilkat.MailMan

#  Configure the POP3 server connection.
$mailman.MailHost = "pop.example.com"
$mailman.MailPort = 995
$mailman.PopSsl = $true
$mailman.PopUsername = "user@example.com"
$mailman.PopPassword = "myPassword"

#  Get the size of a specific message by its UIDL.
$sizeBytes = $mailman.GetSizeByUidl("0000000123abcdef")
$("Message size (bytes): " + $sizeBytes)

#  Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
#  connects and authenticates -- using the property settings above -- whenever a server
#  operation requires it.  Calling the explicit connect/authenticate methods can still be
#  helpful to determine whether a failure occurs while connecting or while authenticating.