High-Volume Webmail Recommendation Needed

I need to consistently send well over 3,000 emails a day and still land in the inbox, not the spam folder. I’m completely open to your suggestions on which web-based platform—or combination of SMTP relay, ESP, or dedicated server—will give me the best possible deliverability... (Budget: $250 - $750 USD, Jobs: Bulk Marketing, Compliance, Email Campaign, Email Handling, Internet Marketing, Marketing)