How to monetize email?

Question

Email

Good day to all The
question is unusual
In fact, there are a lot of electronic mailboxes that are not used, you have to register a lot, and then they are simply stored, I can’t say the exact number, but 20-30 are lying idle right now.
New ones are created 1-2 per week.
Is it possible to monetize this thing somehow?
Maybe there is a site or service where a lot of email is useful?
The only thing that comes to mind is all sorts of spam mailings.
I will be grateful for the answers
Thank you

Answer 1

I think that in any way... and spam is not the best option! - You'll end up in the spam database...

Answer 2

If the names of the boxes are beautiful, then maybe someone will want to buy one for themselves. What are the names, by the way?