Identify and removal of Junk Email IDs from 55k email IDs (To reduce the Hard Bounce Rate)

Dear Freelancer, I am having a list of around 55000 emails in which i am getting around 8% hard bounce rate in Bulk email campaign. Now i want to completely clear the list from that junk emails. In majority of the cases, the email ids were correct once upon a time but now they are not in existence. So, to identify and clear those emails, the only option is to send one test email to all of them. Payment will be released only after checking the filtered list. So, please do not bid if you are not familiar with the process. Thanks