I used to do that too, but now I go to my spam folder and grab the latest phishing email and use the reply-to address. I like the idea of some sales guy following up a lead with a Nigerian scammer, but sadly I’ll never see the email exchange.

In the days when running one’s own mailserver was the common case for small business websites, root@localhost was a fun one. “Why does this freaking thing keep filling its hard drive with our own newsletters?”

I used to go to the trouble of looking up the company's own sales contact or cxo or whatever and subscribing them to themselves, but now I just close the tab.