Mailercloud is a cloud-based email platform that helps businesses send marketing campaigns and high-deliverability transactional emails. With a powerful Email API for developers, teams can send OTPs, alerts, and critical emails at scale with full visibility and performance
This is the 3rd launch from Mailercloud. View more
Mailercloud Email API Platform
Launched this week
Mailercloud Email API helps developers send transactional and marketing emails at scale with 1,000+ emails per second throughput and 99%+ deliverability. Built for SaaS platforms, fintech apps, and growing businesses, it offers real-time tracking, webhook support, domain authentication, and inbox monitoring — so your critical emails land where they should: the inbox.
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Mailercloud
@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?
Mailercloud
Great question @kimberly_ross , It's genuinely both. On our end, we handle the infrastructure layer — authenticated sending with SPF, DKIM, and DMARC alignment, dedicated/shared IP pools with reputation monitoring, real-time feedback loops from ISPs, and automatic suppression of bounces and complaints. But the platform can only do so much — inbox placement ultimately depends on sender behavior too. List hygiene (no purchased lists, regular cleaning), consistent sending patterns, relevant content, and honoring unsubscribes all matter enormously. We guide users on these best practices through our onboarding and support — because even the best infrastructure can't save a spammy campaign. Think of it as: we build the road, but you still need to drive well. 🚗
@vinoop_thayatt In Mailercloud, do you split transactional and marketing sends into separate domains or IP pools so a campaign spike can't hurt OTP deliverability? Domain authentication, inbox monitoring, and webhooks are the right building blocks, and guided warm-up plus suppression defaults would make onboarding feel safer.
Mailercloud
@piroune_balachandran Yes, exactly this! Transactional and marketing traffic run on separate IP pools by default — a campaign spike won't bleed into your OTP delivery. Guided warm-up, suppression defaults, domain authentication, and webhooks are all in place. You've basically described our onboarding checklist! 😄 Glad to see these things matter to you — would love your feedback once you try it.
The move from email marketing tool to full email infrastructure is the right expansion. Teams building SaaS products don't want to stitch together separate providers for transactional and marketing emails, and the deliverability risk of doing it wrong on OTPs and password resets is too high to cut corners on.
99%+ deliverability is the number everyone claims but the real question is how it holds up on cold domains and newly authenticated sending infrastructure. How does Mailercloud handle the warm-up period for new domains, is that managed automatically or does the developer need to control it manually?
Building a SaaS platform myself right now and reliable transactional email for things like billing confirmations and auth flows is exactly the kind of infrastructure that needs to just work without babysitting. Congrats on the launch!
Mailercloud
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! 🚀
This sounds like a powerful tool. Since it supports sending up to 1,000 emails at once, does it also have safeguards in place to ensure deliverability and prevent messages from landing in spam or promotions?
Mailercloud
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!
From my personal experience, there are limitations with reaching out to peoples' inboxes rather than spam when sending multiple exactly the same emails or similar. The algorithms also adapt and try to prevent such things. If I want to send for instance 30 emails to different people saying more or less the same things, what is the chance of it reaching these individuals and can this email be twisted 30 times so that it remains sort of original?
Mailercloud
@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! 😊
This is great, @vinoop_thayatt! Does it sort your email into folders as well? Congrats on the launch!
Mailercloud
Thanks @neilverma , Just to clarify — Mailercloud is an email sending platform, not an email client, so we don't manage your inbox folders. What we do is help businesses send marketing and transactional emails that actually reach the inbox (rather than spam or promotions) through strong authentication, reputation monitoring, and deliverability tooling.
Congrats! Nice expansion, moving from campaigns to infrastructure makes sense. How do you maintain 99% and deliverability at scale?
Mailercloud
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!
This looks brilliant. Is there a secret 'early adopter' code" that makes the second month cost a literal pound? Would love to commit long-term if I can ease into it...
Mailercloud
@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. 😄