You’re probably joking, but in case you aren’t, don’t put in an address for a registered domain like void.com, as you’ll just be redirecting the spam to them.
Instead use the reserved domain example.com.
I just use the domain of the site the account belongs to. If I'm getting really naughty, I will put sales@<server>
Oooh, I hadn’t thought of sales. I always use support@server whenever a site asks if I want to join their newsletter.