Having run both the OPs version and yours they both come back with 0. 
use warnings;
use strict;
use Mail::Webmail::Gmail;

my $gmail = Mail::Webmail::Gmail->new( 
                username => '', password => '', proxy_name => 'localho
+st:3128'
            );

my @labels = $gmail->get_labels();

print "Number of labels returned: ".scalar (@labels)."\n";
    
foreach my $label (@labels) {
    print "Label: $label\n";
}

[download]

From my test above, it would appear that Mail::Webmail::Gmail->new() completes without error even with a known bad password.

2011-01-19 09:29 GMT - restored (in part) after discussion with ww

In reply to Re^4: How to Fetch Gmail by cjb
in thread How to Fetch Gmail by lalitbans

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.