Robust SMTP Setup for Marketing

I’m looking for a proven SMTP solution that can reliably push between 1,000 and 10,000 emails per day. The messages will be a mix of promotional offers and essential transactional notices, so deliverability and server reputation are critical... (Budget: $10 - $30 USD, Jobs: Bulk Marketing, DNS, Email Campaign, Email Marketing, Interspire, Postfix, SMTP)