Sending 100,000 emails in a day is easy. Getting 100,000 emails delivered to the inbox is the hard part — and it has almost nothing to do with raw sending power and almost everything to do with reputation. Here's how high-volume senders do it without getting filtered.
Start with the right infrastructure
High volume needs a dedicated SMTP relay on a clean, dedicated IP — not a shared mailbox and not an IP other people have burned. Our Pro and Business plans are built for 100,000+ sends a day with reputation monitoring included.
Authenticate before you send a single message
Publish SPF, DKIM and DMARC for your sending domain and confirm alignment. At this volume, missing or misaligned authentication guarantees spam folders.
Warm up — you cannot skip this
A new IP or domain sending 100,000 on day one looks exactly like a spammer. Ramp over two to four weeks, starting with your most engaged recipients. Our warm-up guide has a day-by-day schedule, and higher plans include managed warm-up.
Throttle and spread your sends
- Spread the 100,000 across the day rather than firing them in one burst.
- Respect per-provider limits — Gmail, Outlook and Yahoo each throttle differently.
- Use our automatic throttling so you never trip volume flags.
Protect your reputation with list hygiene
This is where most high-volume senders fail. Mail only people who opted in. Remove hard bounces immediately, suppress complainers, and prune recipients who haven't engaged in months.
Watch the numbers
Keep bounce rate under 2%, complaints under 0.1%, and inbox placement above 95%. Our Business and Enterprise plans report these so you can catch problems before they compound. See the metrics that matter.
Ready to scale? Our SMTP plans go up to 500,000 emails a day with dedicated IP pools and a deliverability desk — payable in crypto.