@silverwizard are we talking about general emails (like direct communication with customers and prospects), or marketing campaign/mailing lists?
If the latter, you may consider using a service that is dedicated to this type of messaging (Sengrid, Mailchimp, whatever). It will have its own DKIM signature and a different origin (of course present in SPF records), and would make human, hand-crafted artisan messages written with love less likely to be blocked by a blanket RBL listing.
If the former, then maybe you don't need salespeople after all. Just an OpenAI API subscription and a couple of scripts.