There are many companies that use Gmail as their primary business email. GDPR is highly concerned with protecting personal individual data. Business email addresses can receive cold emails from marketers according to GDPR.  Any email address that identifies the individual is considered personal data. Therefore, if a business email identifies the employee by name then that email is considered as personal data.  GDPR does allow cold emails sent to business emails even if the individual is identifiable from the email. In this situation the marketer must practice ‘legitimate interest’ email content when sending cold emails and have an opt-out link.  GDPR does not stop you marketing to businesses and leaves it up to you to decide if the content you are sending will be of interest to the recipient. What you want to do is pay very special attention to this to avoid complaints.