use WWW::Mechanize;
use HTTP::Cookies; 
use Stream::Reader;
$url="https://webmail.com/exchange";
my $username = "UserName"; 
my $password = "Password123";
my $mechanize = WWW::Mechanize->new(autocheck => 1);
$mechanize->cookie_jar(HTTP::Cookies->new());
$mechanize->get($url);
$mechanize->form_name('logonForm');
$mechanize->field(username => $username);
$mechanize->field(password => $password);
$mechanize->click();
$mechanize->get("https://webmail.com/exchange/username/Inbox/?Cmd=contents&Page=1");
my $page = $mechanize->content();