Yes, it is legal to cold email businesses. However, there are a few things you should keep in mind to make sure your emails are compliant with the law. First, all commercial emails must include a valid physical address and an opt-out link. Second, you can't use false or misleading header information. Finally, your subject line must accurately reflect the content of the email. If you follow these guidelines, you should be able to legally send cold emails to businesses without any problem.