Mailercloud Email API Platform - 1,000+ Emails per Second with 99%+ Deliverability

@vinoop_thayatt Hey Vinoop. How does Mailercloud ensure that emails don’t end up in spam? Is it just technology, or are there best practices users must follow too?

Thanks @joao_seabra , you've nailed exactly why we made this move — no SaaS team should have to juggle two email vendors and hope the deliverability holds on their auth flows.

On the warm-up question: we handle it both ways depending on the plan. For shared IP pools, new senders benefit from the existing warm reputation immediately — no manual effort needed. For dedicated IPs (which we recommend for high-volume transactional senders), we have an automated warm-up scheduler that gradually ramps volume over 2–4 weeks, following ISP-friendly curves. Developers can also override and control the ramp manually if they want fine-grained control — useful when you already have a strong domain reputation and want to move faster.

The cold domain scenario is the real test, and honestly where a lot of ESPs cut corners. We pair the warm-up with domain authentication checks at onboarding — SPF, DKIM, DMARC — so you're not warming up on a misconfigured setup that'll tank anyway.

For billing confirmations and auth flows specifically, we'd put you on a dedicated subdomain + IP from the start and keep it isolated from any marketing traffic. That separation is what keeps OTP delivery rock-solid even if a marketing campaign hits a rough patch. Would love to have you try it out! 🚀

Thanks @x_ronxo , Quick clarification — the 1,000 emails/second is actually our demonstrated throughput capability, not a limit. Our free plan starts with 1,000 emails/month, and we scale with you — if you need 10,000/sec, we can support that too.

On safeguards: yes, absolutely. High-volume sending without guardrails is a recipe for inbox disaster, so we've built several layers in — real-time bounce and complaint monitoring, automatic suppression management, ISP feedback loop integration, and rate throttling per domain to stay within ISP tolerance thresholds. The infrastructure is designed to protect sender reputation at scale, not just push volume. Happy to walk you through how it works for your use case!

Thanks @vik_sh , The key is that we've built the infrastructure around deliverability from day one — dedicated IP pools with smart rotation, real-time reputation monitoring across ISPs, and MTA under the hood for granular per-domain throttling. We also do proactive suppression management and bounce loop handling so bad signals don't compound. At 1B+ emails/month, it's less about one trick and more about catching issues before ISPs do. Happy to go deeper on any specific aspect!

Thanks @anvartk

Thanks @johnbromley , means a lot coming from someone in the space! Would love to hear your thoughts after you test it — always value feedback from people who understand the infrastructure deeply. Give it a spin and feel free to reach out directly if you have questions! 🙌

Thanks @abod_rehman ,That's exactly the vision — one platform, no juggling between tools, consistent deliverability across both. If you ever try it out, would love your feedback! 🚀

@john_oliver11 Ha, no secret pound deals unfortunately — but we do have a generous free tier to ease in, and Product Hunt launch discounts are live right now! Plenty of room to try before you commit long-term. 😄

@viktorgems Great observation, ISPs do flag identical bulk content, so personalization genuinely matters — even small variations like first names, dynamic content blocks, or personalized subject lines make a real difference. Mailercloud supports merge tags and dynamic content for exactly this. That said, we'd always recommend the content feels naturally relevant rather than artificially "twisted" — ISPs are smart enough to detect spinning patterns too. Authentic personalization beats content manipulation every time! 😊