I think this is an attempt to infect my computer.
I'm getting these messages that list my own e mail address where you're supposed to see who the sender is.
They claim to be trying to sell me something and I know I did not send these messages to my email.
I clicked on "details" and found that there was another email address that appeared alongside my own address. '
I do not ever ever ever put my trust in these entities who come out of nowhere trying to sell me something. I went into the settings and blacklisted the sender. I think what might happen though is that they'll just use a different address and keep on bothering me.
Do I just have to keep deleting these messages or is there a way to keep them out of my inbox? I have the spam settings on low because I use this particular email for business purposes.
Sounds like someone just "spoofing" your email address (i.e. making it look like it came from your email account). This is VERY easy to do. If that is what it is, then there is really nothing that you can do other than change your email address to something else...or live with it (i.e. delete messages that come through).
There is a chance that it might be some sort of malware or a hacked email account.
Since you are using a Mac (you did post in the MacOS forum although did not specifically mention using a Mac), the odds of it being malware are pretty low. I am not aware of any malware "in the wild" that will cause your Mac to be a "spambot", but I am by no means always up to speed on what is out there. If you want to be on the safe side, then run some anti-virus/malware software on the Mac.
If the email account is hacked, then the "simple" solution is to change the password for the email account. If it was hacked, then you should stop getting the messages.
My bet is still on someone "spoofing" your email address.