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Mailionaire vs Inboxing
Inboxing offers high-volume Microsoft 365 inboxes priced per domain, built for scale.
| Mailionaire | Inboxing | |
|---|---|---|
| Email platform | Microsoft 365 | Microsoft 365 |
| Who runs it | Done for you (managed) | Self-serve |
| Pricing model | Per active domain, flat — no per-mailbox metering | Per domain (high inbox density) |
| EU / Swiss data residency | Optional EU/Swiss (EU/CH IPs, Microsoft EU Data Boundary) | US IP space |
Inboxing details are a snapshot from mid-2026; check their site for current details.
Choose Inboxing if…
- — You want the lowest cost at very high volume.
- — You are comfortable packing many mailboxes onto each domain.
- — You send mostly to US recipients.
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 it fully managed — set up, monitored, and worn mailboxes and domains replaced for you.
- You want a Swiss-built provider with a flat, predictable per-domain price.
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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