Probably everybody is receiving a good amount of emails by mistake, emails that were meant to somebody with a similar name, emails meant to someone who owned that domain before you, emails meant to another tld. I'm receiving a good few tens of emails a day, some spam, some bills, some account details, some emergencies, some contracts and so one. I've sold a few domains to the owners of the domains which were supposed to receive these emails, but a lot of times they just check my emails and don't really care, even if it's about losing customers or contract. Last night I have received an email from an employee of a company who rebranded to a new name and some emails are still coming to the old name, which is my domain. The email was saying that he is at a load in Oregon( a transport company) and has some issues, regarding a detention and somebody needs to contact him. I've contacted the company letting them know that one of their employees has an emergency, but they don't really cared, they sent an email that somebody will contact me next week. The company is a multi million dollar company, with lots of funding received and around 50 employees in US, so not really small company. I own the domain from 2016, they have changed their name is 2019, but still receiving a good number of emails, some important. There is another way to benefit from these emails and make them aware that they should care about the lost customers and everything else? Did you tried something else?