I think there is some CRM that automatically sends these emails to all the email addresses in their system. Your email address is easy to figure out since every company has something like first.lastname@company.com, finitiallastname@company.com etc. You can use LinkedIn to find people with a particular job title and then spam them.
The most comical set of emails I received was from a company that used an ever escalating set of words and images (e.g. a sad puppy) to try and make me feel guilty and respond. I found the sad puppy one so amusing I almost replied just to say the email made me chuckle.
Click the SPAM button and send it to your Junk Folder. Eventually the CRM system will realize you are never going to respond.
Occasional a sales person will contact me on LinkedIn or tries more personal ways to reach them, I just say that I'm not in a position to make any evaluation or purchasing decisions and I don't know anybody who does. That usually stops everything quickly.