InboxedUp
Alternative & Review

The company was founded in Canada by founder Allahyar Memon.

InboxedUp provides SMTP relay and licensed M365/Google infrastructure for agencies, focusing on high deliverability and isolated sending. They offer solutions for cold email outreach, aiming to prevent downtime and ensure sender reputation. The service is designed for agencies needing to send thousands of emails daily per domain with enterprise-grade infrastructure.

Trustpilot: no reviews found.
G2: no reviews found.

Also, we haven't found any Reddit posts with direct user experience.

🟢 Dedicated tenant isolation
🟢 10x sending capacity (15-20 emails/day vs 1-2/day)
🟢 Microsoft & Google ToS compliant (zero shutdown risk)
🟢 Stable OAuth authentication

🔴 No explicit refund policy found
🔴 No explicit trial mentioned
🔴 Per-inbox sending limits for M365 (10-15 emails/day initially, scaling to 20 after 45 days).

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, ensuring your emails consistently land in the primary inbox rather than getting stuck in spam.
🟢 Self-Healing Rotation: An automated resting period for mailboxes every two weeks that clears provider flags and recovers reputation on autopilot.
🟢 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.

🔴 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.

Based on the information on their website, InboxedUp appears to be a fairly versatile solution. They offer SMTP, Google Workspace, and Microsoft 365 mailboxes at average market prices.

Unfortunately, we were unable to find any public reviews, which is typically a red flag.

Overall, while the solution seems reliable on the surface, we couldn't identify any standout advantages or significant drawbacks. Because of this, we aren't officially recommending them, but we aren't discouraging you from trying them either.

If you are dissatisfied with your current provider, feel free to test them at your own risk – and be sure to share your feedback in the comments section of this article.