Full-cycle email infrastructure

Turn every send into retained revenue.

Mailkeeper is a SaaS solution designed to improve user retention and increase overall product revenue through email marketing.

SPF · DKIM · DMARC
Verified on every send
No hard sending cap
Custom volume above 10M/month
Weekly reporting
On Premium & Pro plans
Dedicated manager
From day one of integration

Why Mailkeeper

Built inside a real product, not for a demo.

Mailkeeper didn't start as a generic ESP. We were built from within a live product, on our own diversified infrastructure — to close every need that product had, minimize risk, and let the team move fast without breaking sender reputation. That work now spans products across different niches, so we read product metrics the way your team does, not just email metrics. Read the full story →

Diversified by design

Runs on multiple providers and MTAs — no single vendor outage or blacklist takes your sending down with it.

Turnkey, start to finish

Validation, domain warm-up, risk-based sending and infrastructure — delivered end-to-end, not stitched together.

A full team, not a ticket queue

Marketers, analysts, developers and QA engineers embed fully in your product — that immersion, not a generic playbook, is a real part of the advantage.

Common pains

Not your problem anymore.

Every one of these has come up with a real product we've worked with. Here's what we do about each.

List hygiene

Usually your problem to manage. Not here — we run our own hygiene solutions and continuously test and adopt the best-performing tools on the market, so it's handled before it ever reaches your list.

Launching new domains

Domain launches keep getting harder — anomalous spam-rate spikes, a low reputation tier right out of the gate, sometimes an outright reject. And the moment you adapt, Gmail changes the requirements again. We treat every launch as our space to run the boldest experiments, so we stay ahead of the shifting rules instead of reacting to them.

Technical setup and compliance

Email markup that renders correctly across every client, meeting every mailbox provider's requirements the moment they take effect, with a clear read on what that does to your business metrics — plus a recovery plan if a new regulation dents them. Also not your problem.

Blocklists like Spamhaus

Minimizing the odds of ever landing on one, and knowing exactly what to do if you do anyway. Also not your problem.

One bad test taking down everything

A single failed test shouldn't be able to take your whole sending infrastructure down with it. We build the foundation so it can't.

Bold ideas, real risk

You want to test — or ship — something genuinely risky. We have the room to run your boldest hypotheses safely, and if it's worth shipping for real, we'll tell you exactly what the risk is and set up the configuration that minimizes it.

Good email numbers, flat product numbers

Everything done right on the email side, and the product still isn't moving. It happens — and it's fixable: we can rebuild the sending logic to optimize for your product's numbers, not just your sender reputation.

Attributing email's real impact

Hard to isolate what email actually contributed to a product metric. Our team has done this across very different products and business models — apps and web, transactional, subscription, and ad-supported — so we know how to trace the line.

Logic outside standard scope

That's not a limitation to us — it's an interesting feature to build. If something doesn't fit a standard plan, we scope it as custom development instead of just saying no.

Product

Everything between "send" and "delivered."

Six pillars, one dashboard. See the full breakdown on the Product page.

Email Validation

Every address checked before it enters your sending flow, cutting bounces and complaints before they start.

Domain Warm-up

New domains and IPs are warmed up on a schedule built to protect reputation from day one.

Risk-Based Security

Sending decisions adjust to the real risk profile of each email and domain, not a flat, one-size-fits-all ruleset.

Diversified Infrastructure

Built on multiple providers and MTAs, so one vendor's outage or blacklist doesn't take down your sending.

In-Depth Analytics

Opens, bounces, complaints and inbox placement, reported on a cadence that matches your plan.

Reputation Strategy

A team with 10+ years in email builds and runs the strategy behind your sender score, not just the dashboard.

In the press

Recognized voices, not just a vendor.

The people running Mailkeeper write and speak publicly about email strategy and engineering — see their work on DOU, Ukraine’s largest tech community.

How it works

From kickoff to your first report.

1

Integration

A dedicated manager sets up full integration with your product — tech, content and sending logic included. Already sending elsewhere? We start alongside your current setup, A/B-testing head-to-head before anything scales onto ours.

2

Choose your plan

Basic, Premium or Pro — sends and campaigns scale independently as your volume grows.

3

Launch & grow

Regular reporting and check-ins keep reputation healthy, with add-on services available as you need them.

Pricing

Plans that grow with your sending volume.

Every plan starts with a one-time $3,000 integration fee. See the full breakdown — including sends, campaigns and add-ons — on the Pricing page.

Basic

$6,199 /mo

Everything needed to start sending, monthly reporting.

Pro

$15,199 /mo

Unlimited sends and full mobile integration.

Need something bigger? See Super Custom plans →

Ready to see your deliverability improve?

A 20-minute call — we'll hear where your product's email is struggling and figure out, together, whether we're the right fit.

Book a call