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 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)

"Tried it mainly because of the good price, but ended up sticking with it since deliverability’s been pretty stable so fa" – 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 System: 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. 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 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.

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.