Yes, they did exist. I stopped using catchall because of them. It's not as common these days, looking at my postfix log. Though some large spammers were shut do

Yes, they did exist. I stopped using catchall because of them. It's not as common these days, looking at my postfix log. Though some large spammers were shut down a few years ago. I saw a sharp 60-70% drop in spam volume when that happened. So maybe someone who was doing this dictionary search gave up or was shutdown too in recent past.