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Mailionaire vs OutEngine
OutEngine is a low-cost, white-label Microsoft 365 inbox provider aimed at agencies and resellers.
| Mailionaire | OutEngine | |
|---|---|---|
| Email platform | Microsoft 365 | Microsoft 365 |
| Who runs it | Done for you (managed) | Done for you (white-label) |
| Pricing model | Per active domain, flat — no per-mailbox metering | Per batch of inboxes (bring-your-own-tenant option) |
| EU / Swiss data residency | Optional EU/Swiss (EU/CH IPs, Microsoft EU Data Boundary) | US IP space |
OutEngine details are a snapshot from mid-2026; check their site for current details.
Choose OutEngine if…
- — Lowest headline cost per inbox is your main priority.
- — You want to resell capacity under your own brand.
- — You send mostly to US recipients and are happy to manage rotation yourself.
Choose Mailionaire if…
- You send to European recipients, or need mailbox data to sit in the EU/Switzerland (EU/CH IPs, Microsoft EU Data Boundary).
- You want one flat price per sending domain, with no per-mailbox metering and no year-two price jump.
- You want it fully managed — set up, monitored, and worn mailboxes and domains replaced for you.
Neither option makes cold email legal: consent and the recipient's local law are always the sender's responsibility, whichever provider you use. See is cold email legal? and what EU residency does and doesn't do.
Want the full picture? Compare all providers side by side, or see how Mailionaire works and what it costs.
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