I have spent a lot of time testing and reading about cold email tools and what people talk about in different communities. Maildoso’s name comes up very often. Their pitch is easy – cheap inbox, instant setup, single dashboard for both Google and SMTP.
However, the reviews were mixed. Some people on the forums called them reliable. While others shared their bad experiences. In this unbiased Maildoso review, I will try to separate the marketing promises from real-life experiences of multiple users.
Key Takeaways
If you want to run an email campaign on a budget, you can buy inboxes from Maildoso. Its primary product is shared-pool SMTP; it also resells Google Workspace inboxes and registers domains (for additional cost). Their setup is quick and easy, suitable for cost-conscious agencies and operators who want fast, cheap mailboxes.
- Consumer: Cost-Conscious Agencies and Solo Operators
- USP: Setup speed and price. Auto-configured mailbox at $2.5
- Deliverability Success: Mixed Reviews
- Risk: Volatile deliverability of the shared pool
- Starting Plan: $75 per month for 30 mailboxes
- Support: Mixed Reviews
Due to their history of blacklist and burned-domain incidents, their shared sending pool infrastructure is a risk.
About Maildoso
Maildoso is a cold email inbox provider where you can buy Google Workspace and SMTP inboxes (minimum 30). It auto-configures SPF, DKIM, and DMARC. But you need a sequencer like Smartlead or Instantly to actually run the campaigns.
The company ran into trouble in November 2025 when their server was blacklisted which impacted hundreds of Maildoso customers.
How Maildoso Works
Maildoso Features
Inboxes on a Rotating Shared Pool
Maildoso hosts your inboxes on a rotating pool of IPs that it owns end-to-end. Meaning: your inboxes are linked to multiple IPs which are also used by other customers. If the IP is flagged for spammy practices, all the inboxes tied will be affected.
Now your deliverability success is relying more on how other inboxes are sending cold emails than your own cold emailing strategy.
Resell Google Workspace Inbox
It resells real Google Workspace inboxes, as every reseller in this category does. The provisioning generally takes up to two hours, and sequencer connection takes up to 24 hours.
Regular Inbox Placement Tests and Health Scores
Maildoso runs regular automated inbox placement tests and shows a health score per inbox in the dashboard. A user can check burn and blacklist status of its inboxes. But, the accuracy of the score is still unknown.
Burned Inbox Remedy
When the system detects a burned inbox, it pauses the inbox from active campaigns, and sets it aside for 14 days for rotation. It automatically triggers the auto-cooldown when the bounce spikes.
Shared Tracking For Link and Image
Using Global Customer Domain Tracking, Maildoso auto-substitutes the links and images in your emails as safe and trusted. You can mention a booking link or CTA into your first email as it won’t affect your deliverability.
Pros
Fast Setup
Setting up DNS across multiple inboxes takes up the whole day. With Maildoso, SMTP inboxes connect to your sequencer in a couple of hours; Google Workspace takes up to 24.
Cost Effective
The actual cost of a Maildoso inbox is $2.50 per mailbox. When you buy in bulk, you’ll get it even for less. It’s cheaper than most cold email service providers’ list prices too.
Built-in Proactive Deliverability Tools
Maildoso includes monitoring features which many cold-email providers don’t offer. You get regular inbox placement tests, and a health score for each inbox. Also it notifies you when the inboxes are burned or blacklisted, with an auto-fix option that pauses affected inboxes.
Proactive Support
The Maildoso support team often offers solutions such as audits and domain swaps to users. The founder has even reached out personally during blacklisted event for clarifying the situation.
Cons
Shared IP Pool Risk
Maildoso hosts inboxes on its shared IP infrastructure. In this case, your deliverability rate depends on the performance of other inboxes on the same IP. For example, if someone in the pool is sending “You’ve won $10,000, send us your bank details to collect the money” and attaches a poorly Canva-ed “Lottery Winner” jpg, the impact of the Lottery campaign will be shared across all the inboxes connected to the IP. Many Maildoso users flagged its shared IP infrastructure and faced deliverability issues.
“the IPs are shared with cold emailers only, which increases the chances of getting blacklisted… make sure you are using an email warm up service and always keep it on.”
u/msham01, r/LeadGeneration
“around week 7-8… about 12 of the SMTP mailboxes started landing in spam more frequently… just a batch that seemed to share similar IPs.”
u/NoWorldliness9061, r/coldemail
Findings from the test: Your campaign is only as good as your IP neighbors.
Blacklist and Burned-Domain Incidents in 2025
In late-2025, Maildoso had a network-wide blacklist event, which saw its domains burned faster than Barry Allen’s top speed. Every Maildoso users saw their domains blacklisted and lost hundreds of thousands of business overnight.
“Looks like they are in big trouble, their IP pool and domains are listed SURBL multi blacklist.”
u/Antosha-Potato, r/coldemail
“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 affect deliverability.”
Verified User in Consulting, G2
Quarterly Plans for the Best Value
The cheapest Maildoso per-index rate of $1.80 is applicable only on the Maildoso quarterly plan which is billed at $2,199/qtr and includes 400 inboxes. In this plan you will also get 100 domains free which will be on shared IP.
“They are just eating the cost of domains. They make up for this by locking you into a 3 month payment plan.”
u/Little_Bowler7849, r/LeadGeneration
Thin Reporting From Basic Dashboard
Maildoso dashboard is pretty generic and the in-app analytics is very thin. For actionable data, users usually prefer to pull data from the sequencer instead.
“dashboard analytics are a bit thin… I have to pull data from my sequencer to really see the health of specific domains, internal view is quite basic.”
Small-Business reviewer, G2
Maildoso Pricing
Maildoso offers monthly and quarterly plans across different inbox combinations. Here is the full Maildoso pricing breakdown.
All plans include
- Mailboxes on the rotating pool · Auto SPF/DKIM/DMARC · IP rotation
- Self-healing recovery · 3-day placement tests · Health scores · Link safety
- 30-day money-back guarantee (monthly plans)
| Category | Billed | Inboxes | Price | Price / Mailbox | Domains |
|---|---|---|---|---|---|
| SMTP | Monthly | 30 | $75 | $2.5 | Not included |
| SMTP | Monthly | 70 | $158 | $2.25 | Not included |
| SMTP | Monthly | 300 | $570 | $1.9 | Not included |
| Combo: SMTP + Google Workspace | Monthly | 15 GW + 15 standard | $90 | $3 each | Requires 6 (not included) |
| Combo: SMTP + Google Workspace | Monthly | 35 GW + 35 standard | $175 | $2.5 each | Requires 14 (not included) |
| Combo: SMTP + Google Workspace | Monthly | 150 GW + 150 standard | $675 | $2 std, $2.5 GW | Requires 60 (not included) |
| Quarterly SMTP | Quarterly | 32 | $299 | $3.1 | 8 free |
| Quarterly SMTP | Quarterly | 68 | $499 | $2.4 | 17 free |
| Quarterly SMTP | Quarterly | 400 | $2,199 | $1.8 | 100 free |
SMTP30$75
- Billed
- Monthly
- Inboxes
- 30
- Price
- $75
- Price / Mailbox
- $2.5
- Domains
- Not included
SMTP70$158
- Billed
- Monthly
- Inboxes
- 70
- Price
- $158
- Price / Mailbox
- $2.25
- Domains
- Not included
SMTP300$570
- Billed
- Monthly
- Inboxes
- 300
- Price
- $570
- Price / Mailbox
- $1.9
- Domains
- Not included
Combo: SMTP + Google Workspace15 GW + 15 standard$90
- Billed
- Monthly
- Inboxes
- 15 GW + 15 standard
- Price
- $90
- Price / Mailbox
- $3 each
- Domains
- Requires 6 (not included)
Combo: SMTP + Google Workspace35 GW + 35 standard$175
- Billed
- Monthly
- Inboxes
- 35 GW + 35 standard
- Price
- $175
- Price / Mailbox
- $2.5 each
- Domains
- Requires 14 (not included)
Combo: SMTP + Google Workspace150 GW + 150 standard$675
- Billed
- Monthly
- Inboxes
- 150 GW + 150 standard
- Price
- $675
- Price / Mailbox
- $2 std, $2.5 GW
- Domains
- Requires 60 (not included)
Quarterly SMTP32$299
- Billed
- Quarterly
- Inboxes
- 32
- Price
- $299
- Price / Mailbox
- $3.1
- Domains
- 8 free
Quarterly SMTP68$499
- Billed
- Quarterly
- Inboxes
- 68
- Price
- $499
- Price / Mailbox
- $2.4
- Domains
- 17 free
Quarterly SMTP400$2,199
- Billed
- Quarterly
- Inboxes
- 400
- Price
- $2,199
- Price / Mailbox
- $1.8
- Domains
- 100 free
Combo plans add isolated Google Workspace inboxes alongside the standard side.
- The “$1.8/mo” inbox is applicable on the 400-mailbox quarterly plan, billed at $2,199 paid up front.
- Lowest inbox price is $1.80 per inbox on the quarterly plan ($1.90 monthly); the 30-mailbox monthly plan is $75.
- A domain costs $12/year and is included free only on quarterly plans.
- The sending limit is 15 cold emails per day per mailbox. To run at volume you need more inboxes (and more domains for Google Workspace mailboxes).
Maildoso vs Aerosend
Maildoso and Aerosend solve the same problem: inbox provider for cold outreach. But the difference in infrastructure justifies the pricing.
Maildoso is a budget cold-email service provider. You can buy inboxes at lower cost, setup is quick, connects a sequencer, and manually runs warmup before cold emailing. The disadvantage of Maildoso inbox is shared IP pool infrastructure. It uses rotating IP pool for inboxes which shares the IP with multiple cold-email senders. Which is why their cost per mailbox is low. Also the risk is huge as one bad IP neighbour can burn the IP and connected inboxes.
About Aerosend
Dedicated Private Infrastructure
- Managed deliverability service built on dedicated, private infrastructure.
- Every 10 domains sit on their own server with their own aged IPs.
- IPs are geography-matched: North American IPs for North American prospects, European IPs for European ones.
Managed Deliverability Layer (run for you)
- Complimentary premium warmup which monitors 6-7 warmup providers, warms inboxes through WarmupInbox.com.
- If a provider degrades, we move you off it so placement holds.
- Warmup volume matched to who you actually email.
- Biweekly seed-list placement tests for every client.
- 6-metric burn detection system that flags domains before its placement drops.
- Proactive IP rotation.
- Free domain reprovisioning if a domain does burn.
Track Record
- 95-99% inbox placement range.
- Longest live domain: 14 months.
- Zero blacklist presence across operating history, monitored daily against Spamhaus, Barracuda, and SURBL.
| Compare | Maildoso | AerosendPrivate infrastructure |
|---|---|---|
| Inbox Available | Google WorkspaceSMTPSMTP on shared pool; GW resold, minimum 30 inboxes | Private infrastructureBuilt for cold email, so no Google or Outlook bans |
| Isolation | ✕Shared IP poolRotating IP pool shared across customers | ✓DedicatedNew isolation every 10 domains / 30 inboxes, never shared |
| Warmup | ✕Via your sequencerNo dedicated warmup; you run it manually | ✓Included, ongoingComplimentary premium warmup, matched to who you email |
| Monitoring | ~Health scores, unverifiedPer-inbox health score; accuracy unknown, thin dashboard | ✓Six metricsEvery domain scored daily and surfaced to you |
| Deliverability | ~Automated tests, undisclosedPlacement tests every 3 days; automatic pause and 14-day rotation, but no placement monitoring to tell you it happened | ✓Our responsibilityBiweekly inbox placement tests, included |
| Domain Burn Alerts | ~Reactive auto-pauseBurned inbox paused 14 days after detection | ✓IncludedBurnt domains flagged within 5 minutes, replaced in one click |
| Pricing | From $2.50/inbox$75/mo for 30 SMTP; $1.80 on 400-inbox quarterly | $4 / inbox$2 per inbox past 150 · 30 inboxes = $120/mo |
| Ready To Test? | Visit Maildoso Website ↗ | Try Aerosend For Free |
Price/Mailbox Breakdown (~5,000 emails/day)
| Requirements | Maildoso | Aerosend |
|---|---|---|
| Inboxes needed | ~334 (sizes to 400 plan) | 200 |
| Send rate per mailbox | 15 | 20-25/day |
| Plan | 400-mailbox quarterly | 150 @ $4 + 50 @ $2 |
| Per-inbox rate | $1.80 | $3.50 (blended) |
| Monthly total | ~$733 | ~$700 |
| Service model | Self-managed | Managed |
Maildoso Support
Maildoso’s primary support channel is a website chat widget. Users can also email help [at] realmaildoso [dot] com. Support hours run US Eastern, 2 AM to 5 PM.
Maildoso Support Review
The Maildoso account is active on Reddit resolving complaints and offering audits and domain replacements. The founder has personally reached out to users during incidents, like the 2025 blacklist event. But their support received mixed reviews.
“they keep your account on hold… they have not solved it for 45 days. On continuous follow-up then simply stop responding.”
G2 reviewer
Even a happy 5-star user had to go through a four-hour chat wait to get the problem resolved.
The Verdict
If you’re new to cold emailing and want to run a campaign at low volume, Maildoso is cheap to start. By its own numbers here it costs about the same as a managed alternative and leaves the deliverability work to you. Cheap inboxes, automatic DNS setup, reasonable tracking, and the flexibility of Google Workspace and SMTP inboxes. You can also monitor the performance of your campaign. The drawbacks: the shared IP pool, which affects deliverability and reply rate, and a history of blacklisting due to spammy activity on that pool.
While Aerosend costs more per mailbox, you’re investing in best-in-class deliverability and reply rates, dedicated IPs, and Namit on support 24/7.
Frequently Asked Questions About Maildoso
