LUNATRO.MX
Alternative & Review

LUNATRO.MX was founded in January 2025 by Fabian Finke and Tea Bici.

It describes itself as enterprise mailboxes for better deliverability, faster outreach, and smarter scaling. Its headline says users can "Always reach the primary inbox," and the site positions the product around Outlook sending infrastructure backed by custom-built SMTP servers.

The product is built for cold email professionals and agencies rather than casual users. The official page says access is limited to qualified cold email professionals, and each $199/month subscription includes 4 domains, 100 inboxes per domain, and up to 30,000 emails per month. The package includes domain registration, SPF, DKIM, DMARC, pre-configured domains, Microsoft Azure-hosted IPs, and a Slack channel for direct support.

The company has no reviews on G2 or Trustpilot, and there are zero mentions from real users on Reddit (which is typically a red flag).

🟢 Large included mailbox volume. One subscription includes 4 domains and 400 inboxes total, which can be efficient for teams that need bulk Outlook-style capacity.
🟢 Outlook and Azure focus. Lunatro's infrastructure is clearly positioned around Outlook sending and Microsoft Azure-hosted IPs, which can be useful for teams that want Microsoft-oriented outreach.
🟢 Direct SMTP sending. The site emphasizes no OAuth process, no reconnecting, and no credential sharing, which can simplify operations for teams that dislike OAuth-based sending workflows.

🔴 Access limited to qualified cold email professionals (to be honest, it’s unclear who can actually use the product and who cannot).
🔴 Low sending limits: These mailboxes allow you to send only 4 emails per day—a stark contrast to SMTP and Google Workspace accounts, which can safely handle up to 30 emails per day without risk.
🔴 Inflexible pricing: The company offers only one fixed plan for 400 mailboxes. If you need more or fewer, you’ll likely find it impossible to purchase the specific quantity required for your business.
🔴 Poor reputation: Among all mailbox types, Azure tenants are known to have the lowest efficiency and frequently land in the spam folder.

Maildoso isn’t a complex management suite or a sequence builder – we know that real outreach needs a rock-solid foundation. We understand how the inbox works way better than those "all-in-one" platforms. From our self-healing mailbox rotation to automated email deliverability infrastructure checks, we do all the technical "dirty work" for you, so you can stop worrying about the tech and get back to closing deals.

We provide high-authority mailboxes designed to stay healthy for months, not weeks, allowing your outreach team to focus on the 1% of deals that matter rather than the 99% of tech that usually breaks. It’s a specialized environment for agencies looking for a reliable SMTP mailbox for agencies that have graduated from generalist tools.

G2: 4.7/5 (181 reviews)

"For the price point it's been worth it for us. We're sending around 1,500-2,000 emails/day across those 100 mailboxes and reply rates have been decent (2.8-3.2% depending on the campaign, but that's more about copy and targeting obviously). The infrastructure has been stable enough that i'm not constantly putting out fires anymore which was the whole point." (My Maildoso review after testing 100 mailboxes over 3 months)

"Checking back in after another 14 days of volume. We’re officially at 500 mailboxes now and the infrastructure is holding up remarkably well. Only 14 boxes are currently in the "cooling off" period, which is less than 3% of the fleet (totally manageable). Reply rates are hovering at 2.3%, keeping our cost per reply at that $0.10 mark. Honestly, the biggest win so far isn't just the price, it’s the lack of "clustering" issues that usually plague us at this volume on GW. (The truth about SMTP in 2026: A very deep Maildoso review (300k emails sent))"

🟢 Dynamic IP Rotation: We don't just "aim" for the inbox – we engineer it. Our system automatically rotates your IP addresses in real-time. If an IP gets flagged or blacklisted, we instantly swap it for a clean one before your campaign takes a hit, ensuring your emails consistently land in the primary inbox rather than getting stuck in spam.
🟢 Self-Healing Rotation System: An automated resting period for mailboxes every two weeks that clears provider flags and recovers reputation on autopilot.
🟢 Hybrid Flexibility: The ability to seamlessly blend high-authority Google Workspace accounts with high-volume SMTP mailboxes.
🟢 Global Customer Domain Tracking: Proprietary technology that allows you to safely include links without compromising your sender reputation.
🟢 Automated Inbox Placement Tests: Free email deliverability infrastructure testing every three days for all mailboxes, giving you real-time visibility into your health.
🟢 Unlimited Technical Audits: Free live sessions with experts who resolve up to 80% of issues through deep server-level forensic audits.
🟢 Advanced Captcha Protection: Technical barriers that shield your outreach domains from being linked back to your primary corporate assets.

🔴 Conservative Limits: We suggest sticking to 15 emails a day per box to keep your domains healthy for the long run. You are free to send more if you choose, but be aware that aggressive "blasting" is a fast track to burning your reputation.
🔴 Google/SMTP Focus: We do not support native Microsoft 365/Outlook environments at this time.

We generally advise against using LUNATRO.MX.

The issue isn’t necessarily with this specific product, but rather with Azure tenants as a whole. Despite their low cost, these accounts simply cannot send a sufficient volume of emails (only 2–4 per day). Furthermore, we frequently hear reports of Azure tenants being blacklisted by email service providers, often leading to a total infrastructure ban that forces the provider to shut down entirely.

If you don't currently have any mailboxes, it's better to start with more reliable providers like Maildoso, Zapmail, or Scaledmail. On the other hand, if you already have an established setup and are simply looking to experiment, there are other Azure tenant providers on the market offering much more flexible and affordable entry-level plans.