Comparison
Jan 24, 2026
CEO and co-founder
Maildoso Deliverability Review: Real Inbox Rates, Mail-Tester Scores & Limitations
Does Maildoso actually work for cold email deliverability?
Yes, Maildoso can deliver emails to inboxes. The platform handles SPF, DKIM, and DMARC configuration correctly, which means your technical setup scores well on diagnostic tools. When the assigned IP maintains clean reputation, users achieve acceptable inbox placement rates.
The problem is that "when the assigned IP maintains clean reputation" qualifier. On shared infrastructure, your inbox placement depends on every other sender using the same IP range. When one aggressive sender spams, they contaminate the entire pool and your campaigns suffer regardless of your own behavior.
According to user feedback on G2, the experience varies dramatically based on timing and luck:
"I've been sending cold emails for years and never burned a domain. Then with Maildoso every single domain was burned in a single day because of a 'large scale issue' they were facing. They replaced all the domains with .click .top .xyz emails, which effect deliverability. Should have been replaced with .com like I purchased."
This review highlights the core reliability problem. Years of careful domain management eliminated in 24 hours due to factors completely outside the user's control.
Another user reported ongoing challenges despite following best practices:
"What I dislike about Maildoso is that even with all the preventative measures we've put in place, our inboxes still seem to get affected pretty quickly. So I'm still unsure if deliverability is actually the issue—or if it's more about the niche we're currently targeting, which is on the riskier side when it comes to health-related content."
What Maildoso's health monitoring actually provides:
Deliverability scores for each inbox
Daily placement checks
Mailbox reputation tracking
These tools help you identify problems after they occur. But they cannot prevent reputation contamination from shared IP neighbors. By the time monitoring shows degraded inbox rates at 55-60% (down from 80%), your campaigns have already suffered and client satisfaction has dropped.
The hidden risk of Maildoso's shared IP infrastructure
Understanding why shared IPs create deliverability volatility requires examining how email reputation actually works.
What "shared IP" means for your campaigns
A shared IP is an IP address used by multiple senders simultaneously. According to Mailtrap's technical documentation, "Since the IP is shared, the sending reputation is shared too. That means your email deliverability rate doesn't depend only on your behavior, it's affected by everyone else sending from that IP."
The operational impact for agencies:
Your careful list hygiene doesn't protect you if another sender spams
Domain rotation schedules get disrupted by IP contamination you didn't cause
Client campaigns pause for 3-7 days during IP recovery periods
Explaining "someone else caused this" damages your agency credibility
The "noisy neighbor" effect in practice
Technical resources from Smartlead explain the mechanism: "If other users engage in spammy practices, such as sending emails to unverified lists, the reputation of the IP can take a hit. This can negatively affect your email deliverability, even if you've done everything right."
Email IP reputation determines whether ISPs deliver your messages to inboxes, reject them, or route them to spam folders. When ISPs detect malicious activity from an IP address, they add it to blacklists. According to Mailtrap's reputation guide, "Your server IP reputation directly impacts email deliverability."
Users have documented domains getting blocklisted (SURBL issues) and replaced with .xyz or .click extensions that further damage deliverability. The Warmy analysis of Maildoso alternatives notes that "using a shared IP system with other users increases the risk of deliverability issues. The lack of IP rotation also makes it harder to avoid spam filters."
How dedicated IPs solve the neighbor problem
We solve the neighbor problem with dedicated IPs. Your sending behavior alone determines your reputation score. We don't assign any other users to your IP range, which means no other senders can contaminate your reputation.
The Aurora Send Cloud technical guide illustrates this with an analogy: "When a neighbor opens a noisy party, it affects everyone's living environment. Similarly, if another sender sends spam or low-quality emails to exploit IP, your email may also receive a penalty from the ISP."
We provide the equivalent of a detached house. Your behavior alone determines your standing with inbox providers.
Analyzing Maildoso's Mail-Tester scores and health checks
High Mail-Tester scores often mislead agencies into assuming their infrastructure performs well. We've seen this pattern repeatedly: agencies show us perfect scores while their emails land in spam. Understanding what these tests actually measure reveals why they provide incomplete information.
What Mail-Tester actually checks
Mail-Tester primarily evaluates technical configuration: SPF records, DKIM signatures, DMARC policies, message formatting, and blacklist status at the moment of testing. According to Courier's guide on reputation tools, "You can use online tools like Mail-Tester, MXToolbox, or DMARC Analyzer to inspect authentication records. For hands-on testing, send emails to test inboxes and review raw headers."
A perfect 10/10 score confirms your DNS records are configured correctly and your message structure follows best practices. It does not confirm your IP has good reputation with Gmail, Outlook, or other major inbox providers.
The gap between technical scores and inbox placement
Litmus research on IP reputation distinguishes between domain and IP reputation: "Domain reputation is tied to the sending domain and affects how your brand is perceived by receiving servers. It builds slowly and persists across IPs. IP reputation is linked to the sending server's IP address and is more transient. Shared IPs can dilute reputation, while dedicated IPs offer control."
You can achieve a perfect Mail-Tester score while your emails land in spam because the IP was flagged yesterday by another sender. The technical setup passes inspection, but the IP reputation fails.
Maildoso's monitoring limitations: The platform includes mailbox reputation checks and daily inbox placement tests. These features help identify problems after they occur, but they function as diagnostic tools rather than preventive measures. The fundamental issue remains: no amount of monitoring can prevent another user on shared infrastructure from damaging the IP reputation your campaigns depend on.
Maildoso pricing vs. deliverability: Is the trade-off worth it?
The pricing comparison requires examining total cost of ownership, not just per-inbox rates.
Maildoso pricing breakdown
Based on third-party analysis, Maildoso pricing follows a volume-based structure:
Inbox Count | Monthly Cost | Cost Per Inbox |
32 inboxes | $100/month | $3.10 |
50 inboxes | $91-137/month | $1.83-2.75 |
400 inboxes | $327/month | $1.83 |
Additional costs include AI warmup ($160-$2,000/month depending on volume) which only works with Gmail and Outlook accounts.
Where the math breaks down
The per-inbox savings look compelling until you calculate the cost of deliverability failures in client churn terms.
The real cost of shared IP failures:
Savings calculation: Maildoso saves you approximately $18/month versus Inframail for 50 inboxes ($147 vs $129)
Churn cost: One $3,000/month client churning due to poor deliverability equals 167 months of savings lost ($3,000 ÷ $18)
Annual math: If shared IP issues cause one client churn per year, you're paying $2,784 to save $216 ($18 × 12 months)
Consider this scenario documented in user reviews: campaigns paused for 3-7 days while waiting for replacement domains to warm up. For an agency with 10 active clients, that downtime equals 30-70 client-days of zero outreach, directly impacting meeting volume and client satisfaction.
Infrastructure costs as % of client billings
Agency founders track infrastructure spend as a percentage of monthly recurring revenue. Industry targets sit at 18-25% to protect margins.
For an agency with 8 clients at $3,000/month average ($24,000 MRR) running 80 inboxes:
Provider | Monthly Cost | % of $24k MRR |
Maildoso | $146-220 | 6-9% |
Google Workspace | $560-672 | 23-28% |
Inframail | $129 + $67 domains | 8% |
But this calculation ignores the hidden cost. When shared IP issues force 3-day campaign pauses and one $3,000 client churns due to poor results, Maildoso's "savings" become a $3,000 loss. That single churn event equals 164 months of the $18/month you saved versus Inframail.
TCO comparison at scale
For 50 inboxes:
Provider | Monthly Cost | IP Type | Risk Profile |
Maildoso | $91-137 | Shared | Variable deliverability |
Google Workspace | $350-420 | N/A | Platform native |
Inframail | $129 flat | Dedicated | Isolated reputation |
The break-even calculation shows we become more cost-effective around 68 inboxes ($129 ÷ $1.90 = 68). But the real comparison involves risk-adjusted returns. Our dedicated IP eliminates the "noisy neighbor" variable entirely.
Pros and cons of using Maildoso for agency campaigns
Where Maildoso works
Budget testing: Initial cold email experiments with zero client exposure
Very small scale: Teams sending under 30 inboxes where shared IP impact stays limited
Short-term campaigns: Promotional pushes where long-term reputation doesn't matter
Where Maildoso creates unacceptable risk
Shared IP contamination: Your deliverability depends on strangers' sending behavior, creating unpredictable results that damage client relationships
Domain replacement quality: Users report receiving .xyz and .click replacements instead of .com domains, further harming deliverability
Unpredictable campaign pauses: IP reputation issues force 3-7 day pauses while new domains warm up, directly impacting client meeting volume
Warmup limitations: AI warmup only works for Gmail/Outlook, not all inbox types your clients need
Client credibility damage: Explaining that "someone else's spam caused your campaign to fail" destroys agency trust and accelerates churn
For agencies where client retention drives profitability, the shared IP model introduces unacceptable variance. One bad week can cost more than a year of per-inbox savings.
Inframail vs. Maildoso: Why dedicated IPs protect your margins
We built our platform on a fundamentally different infrastructure architecture than Maildoso, not just different features. The core difference comes down to IP isolation.
Dedicated IP isolation
We include 1 dedicated US-based IP with our Unlimited Plan and 3 dedicated IPs with the Agency Pack. Your sending reputation builds based solely on your campaigns, your list hygiene, and your content quality. No other senders can contaminate your IP range because you're the only sender assigned to that address.
For agencies operating on 15-20% net margins, this isolation translates directly to predictable client results. Your careful domain management protects your clients' campaigns month after month, not just until a random shared IP neighbor sends spam.
According to Postmark's IP guide, dedicated IPs make sense when you need control over reputation and send consistent volume. They recommend "sending at least 300k messages a month to be able to properly maintain a dedicated IP." Agencies managing multiple client campaigns easily hit this threshold.
Automated DNS configuration
Manual DNS setup for 50 domains consumes significant operational hours. For agencies spending 12-15 hours weekly on infrastructure setup, that's time doing $15/hour work instead of $500/hour sales calls.
We auto-configure SPF, DKIM, and DMARC records without requiring DNS panel access. Watch our 2-minute setup demonstration showing how 10+ inboxes get configured automatically. Our step-by-step tutorial walks through the complete domain-to-inbox workflow.
Another user with over 1,000 accounts shared their experience:
"I personally have over 1,000 email accounts with Inframail for one flat price. Adding all those records would have probably taken dozens of hours. Instead all records were added within 10 minutes." - Verified user review of Inframail
Flat-rate economics
We charge $129/month for unlimited inboxes. Whether you create 50 or 500, the price stays constant. This pricing model eliminates the margin squeeze that per-inbox billing creates as client counts grow.
The margin protection math: An agency with 10 clients at $3,000/month ($30,000 MRR) running 100 inboxes pays $129/month (4% of billings). Add 10 more clients and 100 more inboxes. Infrastructure cost stays $129/month (now 2% of $60,000 MRR). Your net margin improves as you scale instead of being squeezed by per-inbox costs.
Real results from agency operators
Our user interview with Bhavesh Kumar documents 200+ appointments per month using our infrastructure. Jackson Williams shares his results of booking 6 calls per day with consistent deliverability.
These outcomes become possible when infrastructure stops being a variable. Dedicated IPs remove the uncertainty that makes campaign planning unreliable on shared platforms.
Users consistently report strong results:
"I've been using Inframail for a couple of months and the experience has been really good. I can set-up inboxes in 5mins while saving money on Google Workspace subscriptions and benefit from great deliverability. All of my campaigns on Inframail are on a >10% reply rate, which is really good." - Verified user review of Inframail
"Inframail has been absolute gold in terms of delivering a great customer experience, and allowing me to spin up cold email infrastructure at scale for my clients as easily and fast as possible." - Verified user review of Inframail
For a complete walkthrough of our platform capabilities, watch our Ultimate Cold Email Infrastructure Guide for 2025 or see our Inframail 3.5 Demo showing unlimited inbox creation in real-time.
Final verdict: When to use Maildoso (and when to switch)
Maildoso makes sense when:
You're testing cold email concepts with zero client exposure
Budget constraints prevent any alternative (temporary situation)
Campaign failure carries no business consequences
You're sending fewer than 30 inboxes with minimal volume
Switch to dedicated infrastructure when:
Client retention depends on consistent deliverability
You manage 50+ inboxes across multiple campaigns
Unexpected deliverability drops have caused client complaints
Infrastructure costs consume over 20% of client billings
You need predictable results for month-over-month forecasting
The decision framework is straightforward: if someone else's spam affecting your client campaigns represents unacceptable risk, shared IP infrastructure doesn't fit your business model. For agencies managing 50+ inboxes where a single client churn costs more than a year of infrastructure savings, dedicated IPs are margin insurance, not a luxury expense.
Sign up to Inframail and secure dedicated IP infrastructure today. Our step-by-step setup tutorial walks through the complete process from domain purchase to inbox provisioning in under 10 minutes. You can also learn more about how to warm up your inboxes after migrating and review our FAQ documentation. Inframail is trusted by agencies worldwide, with 38 5-star reviews on Trustpilot here.for common questions.
Frequently asked questions
Is Maildoso good for deliverability?
Maildoso can achieve acceptable inbox placement when the shared IP pool maintains clean reputation. However, user reports document entire domain portfolios burned in single days due to other senders' behavior on shared infrastructure, dropping inbox rates significantly.
What are Maildoso's main deliverability issues?
Shared IP contamination creates the primary risk. Users report domains getting blocklisted and replaced with low-quality TLDs (.xyz, .click) that further damage inbox placement rates.
How does Maildoso compare to alternatives for inbox rate?
Maildoso's inbox rates vary unpredictably based on shared IP reputation. Dedicated IP alternatives like Inframail provide isolated reputation that delivers consistent results month over month.
Does Maildoso include email warmup?
AI warmup is available but only works for Gmail and Outlook accounts. Additional warmup costs range from $160-$2,000/month depending on volume.
What is the break-even point between Maildoso and flat-rate alternatives?
At approximately 68 inboxes ($129 ÷ $1.90), flat-rate dedicated IP providers become cheaper than Maildoso's per-inbox pricing while eliminating shared IP risk.
Key terminology
Shared IP: An IP address used by multiple senders simultaneously, where all users share the same sending reputation. Actions by one sender affect deliverability for all others on that IP.
Dedicated IP: An IP address assigned exclusively to a single sender, where reputation depends solely on that sender's behavior. Provides isolation from other users' sending practices.
Burned domain: A domain whose reputation has been damaged by spam complaints, blacklisting, or poor sending practices, making it ineffective for email outreach until reputation recovers.
DNS propagation: The time required for DNS record changes (SPF, DKIM, DMARC) to spread across internet servers globally, typically 24-48 hours for manual configuration.
