Endy Inboxes
Alternative & Review

Endy Inboxes builds private cold email infrastructure. They replace standard Google and Microsoft accounts with their own proprietary system running on dedicated US IPs. They target agencies that want zero technical work. You pay them, and within 30 minutes, they register your domains, configure your DNS, and connect the inboxes to your sending tool. It is a premium, hands-off service.

Endy Inboxes has a 4.1/5 rating on Trustpilot (5 reviews). They do not have a G2 profile.

"The guy who owns EndyInboxes frequently posts here, but he isn't salesy with his approach and gives good information. They also offer domain health checks, however they are the most expensive." — Best Google Mailbox Reseller?

🟢 Dedicated IPs: You control your own IP reputation instead of sharing it with spammers.
🟢 Fast setup: They handle all the DNS and technical work in 30 minutes.
🟢 Direct support: You get help directly through Slack or WhatsApp.

🔴 High prices: Starting at $25 a month for 10 inboxes makes it expensive to scale.
🔴 Manual warm-up: You still have to wait 2-3 weeks to warm up the accounts.
🔴 Closed system: You must use their proprietary infrastructure instead of standard providers.

Maildoso is a cold outreach infrastructure provider – we offer domains, SMTP mailboxes, and Google Workspace accounts. The company was founded in August 2023 in Granite Bay, California, by Nikita Bykadarov (Nikita Maildoso).

While other providers offer shared or dedicated IPs, we have developed IP rotation. This means your emails are sent from hundreds of different IPs (making it harder for spam filters to detect a sending pattern), and whenever any IP gets blacklisted, we automatically swap it out for a clean one.

We have also implemented self-healing mailbox technology, which both restores burned-out mailboxes and protects your active email accounts.

The result? As of May 2026, the spam rate across our entire network of mailboxes is around 5%.

G2: 4.7/5 (181 reviews)

"Tried it mainly because of the good price, but ended up sticking with it since deliverability’s been pretty stable so far" – Thinking about trying "Maildoso". Has anyone here used it? Is it actually better than other tools?

"I tested a small batch first and results were comparable to our Google setup. Ended up moving more campaigns there because of the lower cost. That's a good strategy, buy small package and compare with your current setup" – I want to try Maildoso. What do you guys think about it?

🟢 Dynamic IP Rotation: We rotate 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.
🟢 Self-Healing Rotation: An automated resting period for mailboxes every two weeks that clears provider flags and recovers reputation on autopilot.
🟢 API & MCP Automation: Create domains and mailboxes, export to your sequencer in one call – or manage it all from your AI assistant through our MCP server.

🔴 Conservative Limits: We suggest sticking to 15 emails a day per box to keep your domains healthy for the long run.
🔴 Google/SMTP Focus: We do not support Microsoft 365/Outlook/Azure environments at this time.
🔴 Lack of built-in warmup. We do not have an integrated warm-up yet, but we are currently working on it.

Do not choose a provider just because they offer the cheapest inboxes. Cheap infrastructure always costs more in the long run. When your deliverability drops, you pay for it in three ways:

1. You burn expensive leads. Good B2B data costs money. If your emails land in the spam folder, you waste those leads. You pay for contacts who never even see your pitch.
2. You destroy your domains. Once spam filters flag a domain, it is incredibly hard to fix. You usually have to throw the domain away, buy a new one, and start the warm-up process all over again.
3. You lose revenue. Every email that goes to spam is a missed meeting. In B2B sales, missing one connection can cost you thousands of dollars in closed revenue.

You have to treat cold email infrastructure as an investment. Maildoso.ai gives you the technical tools to protect your domains and keep your emails in the primary inbox. It is the only way to scale outbound sales profitably.

Endy Inboxes is a solid choice if you want a premium, hands-off setup and are willing to pay top dollar for dedicated IPs. But their high prices and lack of automated recovery tools make scaling difficult. Maildoso.ai gives you a better technical foundation. You get automated setup, IP rotation, and self-healing mailboxes at a price that actually lets you scale.