Problem with supposedly bounced emails I've never sent.

[Frustratedlady]

I keep getting these Daemon messages about emails bouncing from addresses I've never heard of nor emailed. I know they are spam, but don't understand the purpose or how to get rid of them. Obviously, they are using my email addy. The following is what I get and I've found that if I wave the mouse over the addy, I get other addy's than Daemon. I don't open them nor click on a link. Can anyone explain what is going on?

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Mail Delivery Subsystem ([e-mail])

Message not delivered
There was a problem delivering your message to [e-mail]. See the technical details below.
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The response was:
Your email to group [e-mail] was rejected due to spam classification. The owner of the group can choose to enable message moderation instead of bouncing these emails. More information can be found here: https://support.google.com/a/answer/168383.