I am not refering to junk mails etc

But I receive emails from people that seem to belong to someone else..

For  example : I had a reply from a company concerning an interview for a job to let this person know the date & time their interview was.

This is one of many : Please tell me it is not possible that someone could be using the same email address as mine / their could be a similarity where a letter or number has been missed off ?

How would I find out ..

Many Thanks for any replies in advance