# Maildoso

> Maildoso is cold email mailbox infrastructure, not a sending platform: it provisions SMTP mailboxes on its own proprietary infrastructure with IP rotation and self-healing account monitoring, registers domains at $12 a year, configures SPF, DKIM, and DMARC automatically, and connects into sequencers such as Instantly, Smartlead, and Saleshandy, priced from $2.50 per mailbox per month at thirty mailboxes down to $0.49 at a thousand.

- Category: Cold Email Outreach (https://saastracker.org/categories/cold-email-outreach)
- Website: https://maildoso.ai
- Starting price: $75 per month for thirty mailboxes, about $2.50 each
- Free plan: No
- Free trial: None, but a thirty-day money-back guarantee applies to new users on monthly SMTP packages
- Founded: 2023, HQ: California, United States, Ownership: Privately held, operated by BacklinkSwappers, Inc.
- Profile last reviewed: 2026-08-22
- Canonical profile: https://saastracker.org/products/maildoso

## Overview

Maildoso is the cheap end of the infrastructure market, and it gets there by making a different architectural choice from its competitors. Where Primeforge and Zapmail provision genuine Google Workspace and Microsoft 365 accounts and charge three to four dollars a mailbox, Maildoso runs its own SMTP infrastructure and sells mailboxes for as little as forty-nine cents. That is not a discount on the same product; it is a different product. Understanding the tradeoff is the whole job of evaluating it.

The tradeoff is throughput per mailbox. Maildoso's own guidance is to send up to about fifteen cold emails a day per mailbox, roughly half what people commonly run on a real Workspace account, with warm-up capacity of about eighty a day. That means you buy more mailboxes to reach the same volume, which is why the pricing looks so aggressive. Do the arithmetic before comparing sticker prices: fifteen a day means about 450 a month per mailbox, so ten thousand monthly sends needs somewhere around twenty-two to twenty-five mailboxes rather than the eleven to fifteen you would run on provider accounts.

What Maildoso adds in exchange is operational tooling that provider-mailbox vendors mostly do not have. Self-healing mailboxes automatically disconnect accounts that have burned out, IP rotation spreads sending across its own address space, inbox placement tests run every three days without you asking, CAPTCHA domain protection shields your real site, and a Global Customer Domain Tracking feature safely rewrites links and images. There is a full API and an MCP server, which is unusual in this layer and genuinely useful if you want an assistant or a script provisioning infrastructure.

As with everything in this layer, be clear on what it is not. Maildoso does not send your campaigns, build sequences, manage replies, or report on results. It is bought alongside a sequencer, never instead of one. It is run by BacklinkSwappers, Inc. out of California, founded by Nikita Bykadarov, and reports around 400,000 mailboxes and more than ten million daily outbound emails across roughly 6,000 to 7,000 companies. There is no free trial, but there is a thirty-day money-back guarantee on new monthly SMTP packages, which is the closest thing to a risk-free evaluation in this market.

## How it works

1. You pick a mailbox package. Monthly plans are thirty mailboxes for $75, three hundred for $225, or a thousand for $499, with custom quantities available from $0.49 a mailbox. Older quarterly bundles that included domains still appear in the pricing tables and are worth checking against the monthly rates before buying.

2. You register domains through Maildoso at $12 a year, choosing from a list that includes .com, .net, .org, .co, .email, .digital, .co.uk, and .de among others, or you connect domains you already own. On monthly plans domains are a separate purchase; the legacy quarterly bundles included them.

3. Maildoso configures DNS for you: SPF, DKIM, and DMARC are written automatically, with setup quoted at under ten minutes end to end. New domains take up to about fifteen minutes to provision, existing domains up to twenty-four hours, and a mailbox itself registers in about five minutes.

4. You connect the mailboxes into your sequencer. Instantly, Smartlead, and Saleshandy have one-click connections, and CSV export covers everything else. The API and MCP server allow programmatic creation of domains and mailboxes for agencies or for anyone driving provisioning from a script or an AI assistant.

5. You then warm and ramp. Maildoso's stated capacity is about eighty warm-up emails a day per mailbox and up to about fifteen real cold emails a day, and its self-healing logic automatically pulls burned-out mailboxes offline. Placement tests run every three days so you find out about a problem from data rather than from a silent collapse in replies.

## Best for

High-volume outbound teams and agencies that have already chosen a sending platform and want the lowest possible cost per authenticated mailbox, accept lower per-mailbox daily sending in exchange, and value automated placement testing, IP rotation, and an API over the prestige of real Workspace accounts.

## Not the right fit for

- Anyone shopping for a sending platform; Maildoso has no sequences, no unified inbox, and no reporting, so buying it alone leaves you with mailboxes and nothing to send from.
- Buyers who need genuine Google Workspace or Microsoft 365 mailboxes for maximum inbox placement into enterprise recipients; that is what Primeforge and Zapmail sell and it is a different product.
- Small businesses sending a few hundred emails a month, for whom thirty mailboxes at $75 is far more infrastructure than the job requires.
- Teams that want high throughput from a small number of mailboxes; fifteen cold emails a day per mailbox is roughly half what provider accounts sustain, so the mailbox count climbs quickly.
- Anyone who will not run warm-up and gradual ramping, since self-healing removes damaged mailboxes but does not prevent you from damaging them.

## Features

### Mailbox provisioning and economics

The cheapest per-mailbox pricing in this layer, with a throughput caveat attached.

- **SMTP mailboxes on proprietary infrastructure**: Maildoso runs its own sending infrastructure rather than reselling Google Workspace or Microsoft 365 tenants, which is why the per-mailbox price is a fraction of provider-account vendors.
- **Volume pricing from $0.49**: Thirty mailboxes at $2.50 each for $75 a month, three hundred at $0.75 for $225, and a thousand at $0.49 for $499, with custom quantities from $0.49. The unit cost falls faster with scale than anywhere else in this market.
- **Fifteen cold emails a day per mailbox**: The vendor's own published guidance, roughly half what a real Workspace account sustains. This is the number that governs how many mailboxes you actually need and it must be in any price comparison.
- **Eighty warm-up emails a day per mailbox**: Warm-up capacity is separate from and higher than cold sending capacity, so accounts can be conditioned faster than they are used.
- **Five-minute mailbox registration**: Individual mailboxes provision in about five minutes, with new domains taking up to fifteen and existing domains up to twenty-four hours.
- **Up to 99 mailboxes per domain, eight recommended**: The platform permits high concentration but explicitly recommends a maximum of about eight per domain, which is the correct advice and worth following even though the tool will let you ignore it.

### Domains, DNS, and authentication

Automated setup in under ten minutes, with a broad TLD list.

- **SPF configured for you**: The Sender Policy Framework record is written automatically per domain, avoiding the syntax and lookup-limit mistakes that cause authentication to fail without any visible error.
- **DKIM keys generated and published**: Signing keys are created and published in DNS on every domain so receiving servers can verify the message has not been altered.
- **DMARC policy published**: A DMARC record is set on each domain, which since the 2024 Gmail and Yahoo bulk sender requirements is a practical precondition for reaching the inbox at any volume.
- **Domain registration at $12 a year**: A wide TLD list covering .com, .net, .org, .one, .co, .email, .ink, .digital, .company, .pro, .services, .space, .co.uk, and .de, which matters for building varied secondary domain pools.
- **Bring your own domains**: Existing domains can be connected and reconfigured, preserving any age they have accumulated, though provisioning takes up to twenty-four hours rather than fifteen minutes.
- **Setup in under ten minutes**: The vendor's quoted end-to-end configuration time, against the hours it takes to do the same work by hand across a registrar and a mail provider.

### Reputation protection across a pool

The operational tooling that justifies choosing Maildoso over cheaper self-assembly.

- **Self-healing mailboxes**: Accounts that burn out are automatically disconnected rather than left sending into a wall, which stops one damaged mailbox dragging a campaign's aggregate metrics down for weeks.
- **IP rotation**: Sending rotates across Maildoso's own IP space rather than pinning every mailbox to one address, spreading reputation risk across the pool.
- **Inbox placement tests every three days**: Automated placement measurement on a schedule, so a deliverability problem surfaces as data within days instead of being inferred from a slowly collapsing reply rate.
- **Mailbox reputation measurements**: Per-mailbox reputation scoring across the pool, which is how you decide what to retire before it does damage.
- **CAPTCHA domain protection**: Shields your primary domain from automated scraping and abuse triggered by outbound activity, which is a specific defence most vendors in this layer do not offer.
- **Global Customer Domain Tracking**: Links and images in your messages are safely rewritten through tracking domains, keeping your real site's domain out of the URL patterns that spam filters cluster on.
- **Primary domain isolation**: The whole architecture keeps outbound on cheap secondary domains, so a blacklisting costs $12 and a handful of mailboxes rather than the domain that carries your invoices and support tickets.

### Integration and automation

An API and an MCP server, which is rare in this layer.

- **One-click sequencer connections**: Instantly, Smartlead, and Saleshandy connect directly, so mailboxes appear in your sending platform without credential copying.
- **CSV export**: For any platform without a native connection, credentials export in bulk rather than one mailbox at a time.
- **Full API access**: Programmatic creation of domains and mailboxes, included rather than gated behind a top tier, which is how agencies provision per client without touching the console.
- **MCP server**: A Model Context Protocol server lets an AI assistant query and provision infrastructure directly, which is a genuinely unusual capability for a mailbox vendor and useful if you script your outbound operations.
- **Free deliverability audits**: Included with plans, giving an outside read on whether the problem is infrastructure, list quality, or copy.

### Commercial terms

Cheap, monthly, and with the market's only real safety net.

- **Thirty-day money-back guarantee**: Applies to new users on monthly SMTP packages. In a market with no free trials anywhere, this is the closest thing to risk-free evaluation available.
- **Monthly packages without a contract**: Thirty, three hundred, or a thousand mailboxes billed monthly, plus custom quantities, with no annual lock required.
- **Legacy quarterly bundles**: Older quarterly packages bundling mailboxes and domains together still appear in the pricing tables, at higher per-mailbox rates than the monthly plans, so check both before buying.
- **No free trial**: Every mailbox carries real infrastructure cost, so evaluation means buying a package and relying on the money-back guarantee if it does not suit.

## Use cases

- **Agency running outbound across many clients**: Hundreds of mailboxes are needed across dozens of domains, and provider-account pricing at three dollars each makes the infrastructure line item larger than the software line item. Outcome: Three hundred mailboxes at $225 a month covers the whole book at seventy-five cents each, the API provisions per client, and self-healing pulls burned accounts out automatically.
- **High-volume lead generation team**: A hundred thousand sends a month is the target and every dollar of unit cost multiplies by a hundred and fifty. Outcome: Roughly 220 to 250 mailboxes at fifteen sends a day each fits inside the $499 thousand-mailbox package with headroom, at a fraction of what provider-account infrastructure would cost.
- **Operator who keeps burning mailboxes**: Accounts degrade silently, campaigns keep sending from them, and by the time anyone notices the aggregate metrics are ruined. Outcome: Self-healing disconnects damaged mailboxes automatically, reputation measurement flags the rest, and placement tests every three days turn deliverability from a guess into a reading.
- **Technical team automating its outbound stack**: Provisioning is scripted, not clicked, and a console-only vendor forces a human into the loop for every client onboarding. Outcome: The full API and MCP server let scripts, or an AI assistant, create domains and mailboxes directly, which no provider-account vendor in this layer matches at this price.

## Pricing

Monthly mailbox packages with steeply falling unit cost by volume, plus separate domain registration at a flat annual rate; legacy quarterly bundles that include domains remain listed.

- **Thirty mailboxes**: $75 per month, about $2.50 per mailbox. 30 SMTP mailboxes; Automated SPF, DKIM, and DMARC; Self-healing mailboxes and IP rotation; Placement tests every three days; API and MCP access. The entry package, aimed at early-stage teams; domains are purchased separately on monthly plans.
- **Three hundred mailboxes**: $225 per month, about $0.75 per mailbox. 300 SMTP mailboxes; Same automation and monitoring; CAPTCHA domain protection; Global Customer Domain Tracking; Free deliverability audits. Where the unit economics become genuinely hard to beat, at roughly a fifth of provider-account pricing.
- **One thousand mailboxes**: $499 per month, about $0.49 per mailbox. 1,000 SMTP mailboxes; Lowest published unit cost in this category; Full API and MCP provisioning; Mailbox reputation measurement across the pool; Custom quantities also available from $0.49.
- **Domain registration**: $12 per domain per year. Wide TLD list including .com, .net, .org, .co, .email, .co.uk, and .de; DNS configured automatically; Bring-your-own-domain also supported; Included in legacy quarterly bundles, separate on monthly plans.
- **Legacy quarterly bundles**: From $299 per quarter for 32 mailboxes and 8 domains. About $3.10 per mailbox, domains included; 68 mailboxes and 17 domains at $499 per quarter; 400 mailboxes and 100 domains at $2,199 per quarter; Higher per-mailbox rate than the monthly packages. Still listed, but the monthly packages are cheaper per mailbox even after adding domains separately.

Billing notes:

- Unit cost falls unusually steeply with volume, from $2.50 at thirty mailboxes to $0.49 at a thousand, so the effective price depends entirely on which package you land in.
- The vendor's guidance of about fifteen cold emails a day per mailbox is the number that makes this pricing comparable to competitors; at roughly 450 sends a month per mailbox you need close to twice as many mailboxes as a real Workspace setup would use.
- Domains are a separate $12 a year on monthly plans and were bundled into the older quarterly packages, which is the main reason to check both pricing tables before buying.
- The thirty-day money-back guarantee applies to new users on monthly SMTP packages and is the only meaningful evaluation path, since there is no free trial.
- Warm-up capacity is included in the mailbox specification rather than sold separately, though a warm-up service still has to drive it, whether that is your sequencer's or a dedicated tool.
- No annual contract is required on the monthly packages, which is unusual in a market that pushes hard for yearly commitments.

Value assessment: Maildoso wins on unit cost and loses on throughput, so model both. At 10,000 emails a month, fifteen sends a day per mailbox implies roughly twenty-two to twenty-five mailboxes, which fits the $75 thirty-mailbox package plus a few domains: cheaper than provider-account infrastructure but not dramatically so, because you are buying nearly twice the mailbox count. At 100,000 a month you need on the order of 220 to 250 mailboxes, which fits comfortably inside the $225 three-hundred package, against roughly $330 to $675 a month for the same volume from Mailforge, Primeforge, or Zapmail. That is the honest shape of it: broadly comparable at low volume, decisively cheaper at high volume, with the open question being whether SMTP mailboxes place as well as real Workspace accounts for your specific recipient base.

## Strengths

- The lowest published per-mailbox cost in this category by a wide margin, down to forty-nine cents at a thousand mailboxes.
- Operational tooling competitors mostly lack: self-healing mailboxes, IP rotation, per-mailbox reputation measurement, and automated placement tests every three days.
- Full API access plus an MCP server, included rather than gated to a top tier, which makes provisioning scriptable and assistant-driven.
- A thirty-day money-back guarantee, which is the only real evaluation safety net in a market where nobody offers free trials.
- Automated SPF, DKIM, and DMARC with setup quoted at under ten minutes and a broad TLD list for building varied secondary domain pools.
- Explicit and honest published guidance on daily sending capacity, at fifteen cold emails per mailbox, rather than vague unlimited-sounding claims.
- CAPTCHA domain protection and safe link and image rewriting, which are specific defences most infrastructure vendors do not offer at all.

## Limitations

- Not a sending platform, so it is always a second bill alongside a sequencer.
- About fifteen cold emails a day per mailbox is roughly half what real Workspace accounts sustain, so you buy far more mailboxes and the sticker-price advantage narrows at low volume.
- These are SMTP mailboxes on the vendor's own infrastructure, not genuine Google Workspace or Microsoft 365 accounts, and some recipient environments treat that difference as meaningful.
- The vendor describes a shared IP pool with rotation, so your sending reputation is influenced by other customers' behavior in a way that dedicated provider accounts avoid.
- No free trial, so evaluation depends on the money-back guarantee rather than a no-risk look.
- Two overlapping pricing structures, monthly packages and legacy quarterly bundles, make comparison unnecessarily confusing.
- The company is small and privately held with limited public corporate disclosure, in a category with a high vendor mortality rate.

## Comparisons

- **Maildoso vs Primeforge**: The clearest architectural split in this layer. Primeforge sells genuine Google Workspace and Microsoft 365 mailboxes at $4.50 a slot with higher per-mailbox throughput; Maildoso sells SMTP mailboxes on its own infrastructure from $0.49 with about fifteen cold sends a day each. If your prospects sit in enterprise Gmail and Outlook tenants and placement is the binding constraint, pay for Primeforge. If unit cost across hundreds of mailboxes governs the decision, Maildoso is several times cheaper.
- **Maildoso vs Mailforge**: Both are the budget option in their respective stacks, but Maildoso goes far lower. Mailforge is $3 a slot with a ten-slot minimum and no placement testing or API; Maildoso starts at $2.50 and falls to $0.49 with self-healing, IP rotation, automated placement tests, an API, and an MCP server. Mailforge's advantage is sitting inside a stack that also sells sending and warm-up; on pure infrastructure merit Maildoso is the stronger buy.
- **Maildoso vs Zapmail**: Zapmail sells real Google and Microsoft mailboxes pre-warmed with custom tracking domains and EU IP options from $39 for ten, roughly $3.90 each. Maildoso sells cheaper SMTP mailboxes with lower daily throughput but far better monitoring and a real API at every level. Choose Zapmail when time to first campaign and provider-account prestige matter; choose Maildoso when you are running hundreds of mailboxes and want the tooling to manage them.
- **Maildoso vs Instantly**: Complementary rather than competing: Instantly is the sequencer and Maildoso is what you plug into it, with a one-click connection. Instantly also sells done-for-you accounts, so there is overlap at purchase, but at any real volume buying infrastructure separately from Maildoso is dramatically cheaper per mailbox and keeps the mailboxes portable if you change sending platform.
- **Maildoso vs Smartlead**: Smartlead connects unlimited mailboxes, which means the only real constraint on your program becomes how many mailboxes you are willing to buy, and that is precisely the constraint Maildoso attacks. The pairing is common for high-volume operators: an uncapped sequencer plus the cheapest authenticated mailboxes on the market, with placement testing on the infrastructure side to catch problems the sequencer will not see.

## Implementation

- Setup time: Under ten minutes for configuration: about five minutes to register a mailbox, up to fifteen for a new domain, and up to twenty-four hours for an existing domain. Real volume still waits on warm-up and ramping, so plan days to weeks rather than minutes before scaling.
- Learning curve: Low for the tool, moderate for the operating discipline. The console and API are simple. What takes judgement is holding to about eight mailboxes per domain and fifteen sends a day each even though the platform will permit far more, and acting on the placement tests rather than filing them.
- Onboarding: Entirely self-serve with published prices and no sales call. Free deliverability audits are included with plans, which is the vendor's substitute for an onboarding call and is more useful than one.
- Migration: Existing domains can be connected rather than re-registered, though they take up to twenty-four hours to provision against fifteen minutes for new ones. Treat domains as the portable asset and mailboxes as disposable: leaving means repointing DNS and losing the hosted mailboxes. Because credentials connect to any IMAP and SMTP sequencer, changing sending platform does not require changing infrastructure.

## Platform, API & security

- Platforms: Web app, Bulk domain and mailbox provisioning console, REST API, MCP server
- API: Full API access for programmatic domain and mailbox creation, plus an MCP server so an AI assistant can query and provision infrastructure directly. Both are included rather than gated to a higher tier.
- Compliance: SPF, DKIM, and DMARC configured automatically on every provisioned domain, CAN-SPAM and GDPR sender obligations remain entirely yours, since Maildoso supplies infrastructure and never touches campaign content, Published daily sending guidance of about fifteen cold emails per mailbox, which is itself a compliance-relevant control
- Data residency: Not published as a selectable option; confirm with the vendor if regional hosting is a hard requirement.
- SSO: Not advertised.
- Security notes: Mailboxes run on Maildoso's own SMTP infrastructure with IP rotation across a shared pool rather than as individual Google Workspace or Microsoft 365 tenants, which is the central architectural difference from provider-account vendors and the reason for both the low price and the lower per-mailbox sending guidance. CAPTCHA domain protection and Global Customer Domain Tracking shield your primary domain from scraping and from appearing in tracked link patterns.

## Support

- Channels: Email support, In-app support, Free deliverability audits included with plans
- Documentation: Documentation and a substantial blog covering cold email infrastructure design, mailbox limits, domain strategy, DNS and authentication, and integration with sequencers.
- Community: Reported user base of roughly 6,000 to 7,000 companies with more than 400,000 mailboxes under management; no official forum.

## Company

- Founded: 2023
- Founders: Nikita Bykadarov
- Headquarters: California, United States
- Ownership: Privately held, operated by BacklinkSwappers, Inc.
- Employees: Not disclosed
- Funding: No outside funding disclosed. The company reports powering over 400,000 mailboxes and more than ten million daily outbound emails for roughly 6,000 to 7,000 companies.

Timeline:

- 2023: Founded by Nikita Bykadarov under BacklinkSwappers, Inc. to supply purpose-built cold email infrastructure rather than resold provider mailboxes.
- 2024: Launches automated SPF, DKIM, and DMARC configuration with domain registration and sub-ten-minute setup, alongside one-click connections to Instantly, Smartlead, and Saleshandy.
- 2025: Adds self-healing mailboxes, IP rotation, mailbox reputation measurement, and inbox placement tests on a three-day cycle.
- 2025: Moves from quarterly bundles toward monthly packages with steeply falling unit pricing, reaching $0.49 per mailbox at a thousand mailboxes.
- 2026: Ships full API access and an MCP server for programmatic and assistant-driven provisioning, and reports over 400,000 mailboxes and ten million daily emails under management.

## Integrations

Instantly, Smartlead, Saleshandy, Any IMAP and SMTP compatible sending platform, CSV credential export, REST API, MCP server

## FAQ

### What is Maildoso and is it a sending platform?

Maildoso is mailbox infrastructure, not a sending platform. It provisions SMTP mailboxes on its own infrastructure, registers domains, configures SPF, DKIM, and DMARC automatically, and connects the mailboxes into a sequencer such as Instantly, Smartlead, or Saleshandy. It has no sequences, no unified inbox, and no campaign reporting, so it is always a second purchase alongside a sending tool.

### How much does Maildoso cost per mailbox?

Thirty mailboxes are $75 a month at about $2.50 each, three hundred are $225 at $0.75, and a thousand are $499 at $0.49, with custom quantities from $0.49. Domains are separate at $12 a year on monthly plans. Older quarterly bundles that include domains still appear in the pricing tables at higher per-mailbox rates, so compare both.

### How many emails can I send per Maildoso mailbox per day?

The vendor's own guidance is up to about fifteen cold emails a day per mailbox, with warm-up capacity of about eighty a day. That is roughly half what a real Google Workspace account typically sustains, which is the single most important fact when comparing prices: you need close to twice as many Maildoso mailboxes to reach the same monthly volume.

### Are these real Google Workspace mailboxes?

No. Maildoso runs its own SMTP infrastructure rather than reselling Google Workspace or Microsoft 365 tenants, which is exactly why it can charge forty-nine cents a mailbox where provider-account vendors charge three to four dollars. If your recipients sit in enterprise Gmail and Outlook environments where provider-account provenance affects placement, Primeforge or Zapmail sell the other kind.

### Does Maildoso set up SPF, DKIM, and DMARC for me?

Yes, automatically on every domain, with end-to-end setup quoted at under ten minutes. New domains provision in up to about fifteen minutes and existing domains in up to twenty-four hours. That automation is the main labor saving, because a single mistyped SPF record or missing DKIM key fails silently and only shows up as a collapsed reply rate weeks later.

### How does Maildoso protect domain reputation across a pool?

With more active tooling than most vendors in this layer. Self-healing mailboxes automatically disconnect accounts that burn out, IP rotation spreads sending across its address space, per-mailbox reputation measurement tells you what to retire, and inbox placement tests run every three days so problems surface as data. Structurally it also keeps outbound on cheap secondary domains, and recommends about eight mailboxes per domain even though the platform permits up to ninety-nine.

### Does Maildoso include warm-up?

Mailboxes are specified to handle about eighty warm-up emails a day, but a warm-up service still has to drive that traffic, whether it is the one bundled in your sequencer or a dedicated tool. Provisioning and warming are different jobs, and treating a freshly provisioned mailbox as ready for full volume is the most common way to waste the purchase.

### Does Maildoso have an API?

Yes, full API access for programmatic domain and mailbox creation, plus an MCP server that lets an AI assistant query and provision infrastructure directly. Both are included rather than gated behind a top tier, which is unusual in this layer and genuinely useful for agencies onboarding clients from a script.

### Is there a free trial?

No free trial, but there is a thirty-day money-back guarantee for new users on monthly SMTP packages. In a market where no infrastructure vendor offers trials because every mailbox carries real cost, that guarantee is the closest thing to a risk-free evaluation available, and it is a fair reason to start here when comparing options.

### How many mailboxes do I need for my volume?

Work back from fifteen cold emails a day, roughly 450 a month per mailbox. 10,000 emails a month needs about twenty-two to twenty-five mailboxes, which fits the $75 package. 100,000 a month needs on the order of 220 to 250, which fits inside the $225 three-hundred-mailbox package with headroom. That second figure is where Maildoso's pricing becomes decisively cheaper than provider-account infrastructure.

## Editorial verdict

Maildoso is the volume play in cold email infrastructure, and it is honest about the trade it is making. You get SMTP mailboxes on the vendor's own infrastructure rather than real Workspace accounts, with about fifteen cold sends a day each instead of thirty, and in exchange the unit cost falls to a level nobody else approaches. At a hundred thousand emails a month that difference is hundreds of dollars, and the operational tooling that comes with it, self-healing mailboxes, IP rotation, reputation measurement, three-day placement tests, a full API, and an MCP server, is better than what most competitors ship at four times the price. Two things should govern the decision. It is not a sequencer and never will be, so budget for two products. And the mailboxes are not provider accounts, so if your prospect base sits in enterprise Gmail and Outlook tenants where that provenance affects placement, test carefully during the thirty-day money-back window before committing at scale.

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Source: SaaSTracker (https://saastracker.org), an independent editorial project. This profile is compiled from public information, carries no peer reviews or paid placement, and was last reviewed 2026-08-22. Awards are judged on published criteria: https://saastracker.org/methodology