Perl

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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Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# 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.

my $mailman = Chilkat2::MailMan->new;

# Configure the POP3 server connection.
$mailman->MailHost('pop.example.com');
$mailman->MailPort(995);
$mailman->PopSsl(1);
$mailman->PopUsername('user@example.com');
$mailman->PopPassword('myPassword');

# Get the size of a specific message by its UIDL.
my $sizeBytes = $mailman->GetSizeByUidl('0000000123abcdef');
print 'Message size (bytes): ', $sizeBytes, "\n";

# 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.