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Mailionaire vs Mailrun
Mailrun is an automated Microsoft Azure email infrastructure service with flat monthly tiers.
| Mailionaire | Mailrun | |
|---|---|---|
| Email platform | Microsoft 365 | Microsoft Azure |
| Who runs it | Done for you (managed) | Done for you (automated) |
| Pricing model | Per active domain, flat — no per-mailbox metering | Flat monthly tiers (by inbox bundle) |
| EU / Swiss data residency | Optional EU/Swiss (EU/CH IPs, Microsoft EU Data Boundary) | US IP space |
Mailrun details are a snapshot from mid-2026; check their site for current details.
Choose Mailrun if…
- — You want Azure inboxes with simple flat tiers.
- — A fixed bundle price suits your volume.
- — 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 would rather pay per sending domain you actually run than for a fixed bundle.
- 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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