I get emails like this all the time:
Hello dear, I’m a long time reader. I’m writing to you because I’d love to contribute a guest post on your website. I’ve been brainstorming some topics that I think your readers would get a ton of value from: [The Best XXXL Extra Large Electric Heating Pad on Amazon for Full Body] I’ll make sure the piece overflows with information that can’t be found anywhere else. Looking forward to your reply. Have a nice day, Lekin
It's from an ordinary looking hotmail account, and AFAICT contains just this text. There are no links to click, so it's not an ordinary phishing email.
If they really thought I'd like to include their content on my blog, if I had one, surely they know a spammy Amazon product name would be a turnoff.
So it feels like there's some other agenda here, but I can't figure out what it would be.