folks, what do you think about inbox resellers? To expand outbound sales, is it a worthy way to create many inboxes and get them through these resellers such as premiuminbox or scaledemail?

Yea diversify. Google is tighten inbox filters because of the holidays. So infra & copy is very important right now.

And yes inbox resellers is a good approach, there all different, I haven't used those, heard good things about hypertide but just pick one or two & move fast! Test, test, test. I have mission inbox, inboxing & LGJ, all 3 diff infrastructures: Google, Microsoft & SMTP

You can try hyperscaleinboxes.com with a free month trial. It's the same like hypertide but we're providing in a reasonable pricing without any setup fee. We're so confident that's why we're providing free month trial to check then pay for the next month if you'll satisfy.

I'm considering premiuminboxes for gmail, hypertide or scaledmail for outlook

I'm also exploring inbox resellers or similar solutions to scale faster. Any recommendations or thoughts at this moment?

Yes, but I always recommend diversifying your inbox portfolio. Purchase a from multiple resellers. I’ve also had good experiences with Zapmail and Primeforge as well.