. It may take the lead generation process to a completely different trajectory. For example, you may end up making telemarketing calls to people who don't exist! Email lists often contain defunct email ids, ids of people who are now dead or simply not using that id anymore. These databases are hardly cleaned and are packed with spam traps, bots and other ways that email service providers use to prevent spamming. BPO units have to ensure that they are using a clean database whenever they think of sending emails. You can make better inroads at sales lead generation if you are doing things the right way, even if it happens to be the harder way.