High-Volume Inbox Mailer Tool

I need a solid solution that lets me send at least 100 000 plain-text emails every day from my business domains and still land in the primary inbox, not the spam folder. The messages are simple text (no fancy HTML), yet I still want full visibility on both opens and link clicks. Right now I rely on an Excel mass-mail add-in, but it stalls at roughly 600 messages before throwing a “limit exceeded” error. I want to break free of that cap entirely. The ideal tool or custom build you provide must: • Accept my existing business email addresses and present each message as a normal one-to-one email—no provider logos, footers, or “sent via” branding. • Sustain 100 k+ deliveries per day without throttling. • Keep deliverability high through proper authentication (SPF, DKIM, DMARC) and any IP rotation or warm-up logic you recommend. • Include a lightweight dashboard or reporting file where I can instantly see open and click metrics. If you already have a proven system, great—show me how it will plug into my workflow. If you plan to develop a custom app, outline the tech stack and rollout timeline so I know exactly what to expect.