Are you pursuing leads that typically don’t engage with external recruiters or agencies?

About a month ago, my company closed its doors, prompting me to pursue a more independent recruitment career. I’m reaching out to potential clients, and as someone who’s still getting the hang of sales, I’d love some advice on handling this situation: If a company indicates they have a policy against partnering with external recruiters, should I continue to follow up with them? What’s the best approach in this scenario?