Microsoft 365 email infrastructure · built in Switzerland
Real inboxes for cold email, delivered and kept healthy.
Mailionaire sets up real, isolated Microsoft 365 mailboxes, configures the DNS, and replaces them as they wear out — so your campaigns keep landing. Built in Switzerland, with optional EU/Swiss data residency. One flat price per domain.
$50/month per active domain · up to 100 mailboxes · 14-day money-back guarantee.
What it is
Managed mailbox infrastructure, not another mailbox pool.
Cold email needs sending inboxes that are separate from your main company domain, properly authenticated, and ready to be replaced when they wear out. Building that by hand — tenants, mailboxes, DNS records — is slow and easy to get wrong. Mailionaire does it for you.
- Each domain is its own isolated Microsoft 365 tenant — not a shared mailbox on someone else's IP.
- Up to 100 mailboxes per domain, with SPF, DKIM and DMARC configured for you.
- Built and run in Switzerland, with optional EU/Swiss data residency on EU/CH IP space.
- Worn mailboxes and domains are monitored and replaced as part of the plan.
Why Mailionaire
Three things we do differently.
Genuinely European
Mailionaire is built and run in Switzerland. Turn on EU/Swiss residency and your mailbox content sits at rest in the EU/Switzerland on EU/CH IP space, under the Microsoft EU Data Boundary — something no other Microsoft 365 cold-email provider offers.
Honest pricing
One flat price per active domain. The price you see is the price that renews. No hidden tiers, no per-mailbox metering, no surprise increase in month thirteen.
Self-healing
Sending domains wear out. We monitor deliverability signals and DNS, and replace worn mailboxes and domains so your sending keeps moving. Backed by a 14-day money-back guarantee.
How it works
From domain to sending in four steps.
Choose a domain
Pick a sending domain. Each domain becomes its own isolated Microsoft 365 tenant — not a shared mailbox on someone else's IP.
We deliver the inboxes
We provision the tenant, create the mailboxes, and set the DNS (SPF, DKIM, DMARC). You watch real provisioning status, not a fake progress bar.
Connect your sequencer
Your mailboxes export straight into your cold-email tool. Start sending from real, isolated Microsoft 365 inboxes.
We keep them healthy
We watch for blacklisting, DNS drift, and bounce spikes, and replace worn mailboxes and domains as they wear out, so your sending keeps moving.
Pricing
$50 per active domain. That's the whole price.
No base fee. No minimum. No per-mailbox metering. One consolidated invoice each month — and the price you see is the price that renews.
Straight talk
European infrastructure, honestly described.
Mailionaire is built and run in Switzerland. Turn on EU/Swiss residency and your mailbox content sits at rest in the EU/Switzerland under the Microsoft EU Data Boundary, on EU/CH IP space — something no other Microsoft 365 cold-email provider offers. For recipients in the US, US IP space usually delivers better, so residency is a toggle, not a forced default.
What it does not do: data residency does not make cold email legal. Consent rules still apply, and several European markets (Germany, for example) require opt-in even for business-to-business email. You are always responsible for sending in line with the law of each market you contact. We provide compliant infrastructure — not legal cover for sending.
FAQ
Common questions
What is Mailionaire?
Mailionaire is managed email infrastructure for cold email. It provisions real, isolated Microsoft 365 mailboxes (one tenant per sending domain), sets up the DNS (SPF, DKIM and DMARC), and keeps them healthy so your outbound campaigns keep landing. It is built and run in Switzerland, with optional EU/Swiss data residency.
How is it priced?
One flat price of $50 per month per active domain. A domain covers up to 100 mailboxes. There is no base fee, no minimum, and no per-mailbox metering. You get one consolidated monthly invoice.
What does a domain include?
Each active domain is its own isolated Microsoft 365 tenant with up to 100 mailboxes, configured DNS, and ongoing monitoring. Worn mailboxes and domains are replaced as part of the subscription.
What makes the European setup different?
Mailionaire is built and operated in Switzerland. You can switch on EU/Swiss data residency so mailbox content sits at rest in the EU/Switzerland on EU/CH IP space, under the Microsoft EU Data Boundary. No other Microsoft 365 cold-email provider offers licensed M365 on EU/CH IPs. Residency is an optional add-on (+20%); for recipients in the US, US IP space usually delivers better.
Does European infrastructure make my cold email legal?
No. Data residency is about where your mailbox data is stored and which IPs you send from — not about consent law. You are always responsible for sending in line with the rules of each country you email. Mailionaire provides compliant infrastructure, not legal cover for sending.
Is there a free trial?
Instead of a free trial that provisions real mailboxes, Mailionaire offers a 14-day money-back guarantee, so you can try the product with your own sending and still get a refund if it is not a fit.
Which sequencers does it work with?
Your mailboxes are standard Microsoft 365 inboxes, so they connect to common cold-email sequencers. Reach out at support@mailionaire.ch if you want to confirm your specific tool.
Ready to send from real Microsoft 365 inboxes?
Start with one domain. Add more whenever you need them.