1M+ Emails/Month — Unit Cost
🏆 Best overall: Amazon SES
At 1–5M/mo, per-1k differences dominate. Dedicated IP amortizes, free tier irrelevant.
Ranked for this Use Case (Top 6)
Recommendations
🏆 Floor PriceAmazon SES
$0.10/1k = $200/mo at 2M — floor, + dedicated IP $24.95.
🥈 Managed CheapestSendGrid (Twilio)
Essentials $19.95 floor + $0.15/1k beyond — cheaper than Postmark at this volume.
🥉 EU at ScaleBrevo
Business tier negotiable at 2M+ with EU residency.
Key Takeaways
- At 2M, $1.25 vs $0.10 per-1k = $2300/mo swing.
- Warm dedicated IP gradually — cold IP at 1M spikes hurts sender score.
Gotchas
- SES reputation warm-up is DIY — avoid cold 1M blast.
- Postmark caps throughput deliberately — not built for 2M surges.
Model your exact volume
Configure transactional vs marketing split and dedicated IP.