Radr wants to make senders pay to send an email to your inbox. In an interview with Tech in Asia, co-founder Ranjit Parasuraman explained the concept.Spam is one of the biggest problems that professionals face daily. It clogs up their inboxes and prevents them from getting to the mails that matter. While there are many solutions to deal with spam, none are fool proof. The sender only needs to know your email address to start sending emails.“We are empowering people to make email senders pay a fee to get their reply,” said Parasuraman.“This helps recipients control incoming messages and puts a price on their time. Meanwhile, Radr refunds senders if their messages are ignored,” he added.