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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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;  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.

$oMailman = ObjCreate("Chilkat.MailMan")

;  Configure the POP3 server connection.
$oMailman.MailHost = "pop.example.com"
$oMailman.MailPort = 995
$oMailman.PopSsl = True
$oMailman.PopUsername = "user@example.com"
$oMailman.PopPassword = "myPassword"

;  Get the size of a specific message by its UIDL.
Local $iSizeBytes = $oMailman.GetSizeByUidl("0000000123abcdef")
ConsoleWrite("Message size (bytes): " & $iSizeBytes & @CRLF)

;  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.