Is there a way to check if the message I sent through email was opened and read?

I haven't got a reply for a while and its a very important email.


I'm positive that the other contact received the mail, but I'm not sure if the other contact had time to check and read the mail.

Is there a way to check if the message I sent through email was opened and read?
There is no way of knowing if an email has been opened or read.