transport => Email::Sender::Transport::SMTP->new(
                {
                  host          => $FooBar::Host,
                  port          => $FooBar::Port,
                  sasl_username => $FooBar::User,
                  sasl_password => $FooBar::Password,
                }
[download]

Don't worry about $FooBar, that's just the simplified name for my local authentication module. Just put your site-specific values for the mail host, the port it uses, the user and the password here. As before, those values should come from some sort of configuration file that is *not* stored in your repo. Never commit credentials to your repo. Never.