The Maildoso Insider’s Guide
Everything we know about Maildoso in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Maildoso
The Insider’s Guide
Cold email mailboxes and domains sold by the mailbox
Every plan, grade, refund rule and rival among cold outreach tools, read from Maildoso’s own pages.
Made by BacklinkSwappers, inc. · checked Nov 12, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Maildoso’s own pages, its app-store listings and our grades. Every fact in it is on Maildoso’s page too, where it is kept up to date. Checked Nov 12, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
1.4
GPA, above 0 of the 47 other cold outreach tools we grade
Maildoso supplies mailboxes and domains built for outbound email and sets up SPF, DKIM and DMARC for them. It is infrastructure rather than a sequencer: you export the mailboxes to a tool such as Instantly or Smartlead. Pricing is a monthly fee for a block of mailboxes, with domains bought separately.
To get you started, here are 8 things to know about Maildoso, taken from its own pages and our grades.
You export them to a sequencer like Instantly or Smartlead.
- 1
Best for blocks of cold-email mailboxes
Maildoso supplies mailboxes and domains for outbound email and sets up SPF, DKIM and DMARC.
- 2
Paid plans start at $75 a month
As its pricing page puts it: $75 per month for 30 mailboxes.
- 3
It runs on Web
Web.
- 4
Mailboxes built for outbound
Dedicated mailboxes on the vendor's own servers and IPs, with IP rotation and automatic replacement of IPs that stop working.
- 5
Automatic DNS setup
SPF, DKIM and DMARC records are configured when you register mailboxes under a domain bought or connected through the dashboard.
- 6
Self-healing and health scores
Burned-out mailboxes are disconnected from campaigns for 14 days, and inbox placement tests run every 3 days with a health score per mailbox.
- 7
A 1.4 GPA, above 0 of 47
That is against the other cold outreach tools we grade, on value, the free plan, features, ease of use and platforms.
- 8
You could make this
What Maildoso does at its core is plain work, and that is the kind of thing an AI app builder makes well.
Maildoso at a glance
- Pricing
- Paid, from $75 per month for 30 mailboxes
- Free plan
- No
- Free trial
- None stated
- Runs on
- Web
- Made by
- BacklinkSwappers, inc.
- Category
- Cold Outreach
- Our grade
- 1.4 GPA, weak
The report card
Best for blocks of cold-email mailboxes
Maildoso supplies mailboxes and domains for outbound email and sets up SPF, DKIM and DMARC. You export them to a sequencer like Instantly or Smartlead. The floor is $75 a month for 30 mailboxes, domains cost extra, and each mailbox sends at most 15 cold emails a day.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | D | $75 a month for 30 mailboxes is the smallest plan, which is where the category's dearest tenth begins. Domains aren't included. It is cheaper per mailbox as blocks grow. |
| Free plan and trial | F | No free plan and no trial on record. It also has a no-discount policy. |
| Features | D | Mailboxes and DNS only. It is infrastructure and needs a separate sender, and each mailbox is capped at 15 cold emails a day. |
| Ease of use | C | No store rating on record. Mailboxes come set up, but new ones need about 14 days of warm-up and a sender to connect. |
| Platforms and integrations | B | Web, exporting to Instantly, Smartlead, Saleshandy and EmailBizon. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Maildoso is for
- Fits if you need 30 or more mailboxes for an outbound team
- Works for senders who already run Instantly or Smartlead
Who it is not for
- Skip it if you need just a few mailboxes, since 30 is the smallest block
- Not for you if you want a trial or a discount, because neither exists
- Watch out: domains cost extra, $15 a year or $11.90 a month pre-warmed
- Tight if you want volume per mailbox: 15 cold emails a day each
Good to know
Good for
- Agencies and sales teams that send from many secondary domains
- Teams that already use a sequencer and want cheap extra mailboxes
- Buyers who want mailbox setup done through an API
Worth knowing
- Each mailbox sends at most 15 cold emails and 80 warm-up emails a day, and new mailboxes still need about 14 days of warm-up unless they sit on pre-warmed domains.
- Domains are not included in monthly plans: registration is $15 a year and a pre-warmed domain is $11.90 a month.
- Quarterly plans with domains included are labeled legacy on the pricing page; the monthly blocks are the current plans.
- Subscriptions are canceled through support chat or email, and the page says it has a no-discount policy with no promotions.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$75
A month to start
Maildoso is a paid product, starting at $75 per month for 30 mailboxes.
It is cheaper per mailbox as blocks grow.
30 mailboxes
$75
per month for 30 mailboxes ($2.50 each)
Aimed at early-stage teams. Up to 15 cold emails a day per mailbox, plus the features every plan includes.
300 mailboxes
$225
per month for 300 mailboxes ($0.75 each)
Aimed at expanding teams. Same features and 15-a-day limit per mailbox as the smaller block.
1,000 mailboxes
$499
per month for 1,000 mailboxes ($0.49 each)
Aimed at large-scale campaigns. Same features and per-mailbox limit.
Read from maildoso.ai on Nov 12, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Cold email mailboxes and domains sold by the mailbox. Here is what it does, as its own site describes it, and what it covers: public API, dMARC.
Web, exporting to Instantly, Smartlead, Saleshandy and EmailBizon.
- Mailboxes built for outbound
- Dedicated mailboxes on the vendor's own servers and IPs, with IP rotation and automatic replacement of IPs that stop working.
- Automatic DNS setup
- SPF, DKIM and DMARC records are configured when you register mailboxes under a domain bought or connected through the dashboard.
- Self-healing and health scores
- Burned-out mailboxes are disconnected from campaigns for 14 days, and inbox placement tests run every 3 days with a health score per mailbox.
- Sequencer export
- Mailboxes can be exported to outreach platforms; Instantly, Smartlead and EmailBizon sync with one click, and the vendor says 9 sequencers are supported.
- API and MCP server
- Register domains, create mailboxes and push them to a sequencer from code or from an AI assistant such as Claude.
- Pre-warmed domains
- Domains warmed in advance, each holding up to 50 mailboxes, so new mailboxes can start sending without the usual 14-day wait.
Where it runs
- Web
What it works with
- Instantly
- Smartlead
- Saleshandy
- EmailBizon
Maildoso is made by BacklinkSwappers, inc.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
0/47
Other cold outreach tools it is graded above
Maildoso's GPA of 1.4 is higher than 0 of the 47 other cold outreach tools we grade, and level with 2.
It stands best on platforms and integrations (B, above 9 of 47) and worst on free plan and trial (F, above 0).
Its paid plans start at $75 a month, against a middle price of $39 for the category: 39 of the 43 others that charge start lower.
On features, ease of use and platforms it scores 2.0 out of 4. 30 tools score higher and cost less.
Each grade against the category
Every bar is all 48 cold outreach tools we grade, cut by the letter each got. Maildoso’s own letter is outlined.
- DValue for moneyAbove 0 of 47
- FFree plan and trialAbove 0 of 47
- DFeaturesAbove 0 of 47
- CEase of useAbove 0 of 47
- BPlatforms and integrationsAbove 9 of 47
Price against what you get
Each dot is one of 44 cold outreach tools. Further left costs less; higher up scores better on features, ease of use and platforms. Maildoso is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
You could make this
What Maildoso does at its core is plain work, and that is the kind of thing an AI app builder makes well.
You would give up 2 things, listed below, and little else. It costs $900 a year. An AI app builder starts at about $20 a month on our listings, and you only need it while you build.
What you could make
- It runs in a browser, which is where something home-made would run too.
What you could not
- Reading the reports inbox providers send about your domain.
- It plugs into other products, Instantly, Smartlead and Saleshandy among them, and has an API.
What this rests on. Maildoso’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Mailforge, Infraforge, Inboxkit, Instantly and Smartlead
The 5 tools Maildoso is most often weighed against, with where each one differs from it.
- 1.6GPA
Mailforge
From $3/mo
Shared-IP domains and mailboxes built for cold email sending.
- Mailforge also covers inbox warm-up.
- 1.6GPA
Infraforge
From $4/mo
Private cold email infrastructure on dedicated IPs.
- Infraforge also covers inbox warm-up.
- 1.8GPA
Inboxkit
From $2.50/mo
Google and Microsoft mailboxes for cold email, priced per mailbox.
- Inboxkit also covers inbox warm-up.
- 2.6GPA
Instantly
Free trial · from $37.6/mo
Cold email from unlimited inboxes, priced by emails and contacts.
- Maildoso also covers dMARC.
- Instantly also covers workflow automation, AI agents and email campaigns.
- 2.6GPA
Smartlead
Free trial · from $32/mo
High-volume cold email with unlimited mailboxes and client workspaces.
- Only Smartlead lists iOS and Android apps.
- Maildoso also covers dMARC.
- Smartlead also covers sales pipeline, AI agents and email campaigns.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
13
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Maildoso free?
No. Maildoso is a paid product, starting at $75 per month for 30 mailboxes.
How much does Maildoso cost?
Maildoso lists 3 plans. 30 mailboxes: $75 per month for 30 mailboxes ($2.50 each).
What platforms does Maildoso work on?
Maildoso is available on Web.
Does Maildoso have an Android app?
No Android app was listed when its pages were read on Nov 12, 2026. Maildoso is listed for Web.
Does Maildoso have an iPhone app?
No iPhone app was listed when its pages were read on Nov 12, 2026. Maildoso is listed for Web.
Is Maildoso open source?
Maildoso is not described as open source on its own site, as read on Nov 12, 2026.
Does Maildoso have an API?
Yes. Maildoso offers a public API, according to its own site.
What does Maildoso integrate with?
Maildoso's listing names Instantly, Smartlead, Saleshandy and EmailBizon.
Who makes Maildoso?
Maildoso is made by BacklinkSwappers, inc.
What are the alternatives to Maildoso?
The closest alternatives to Maildoso in our directory are Mailforge, Infraforge, Inboxkit, Instantly and Smartlead.
How does Maildoso compare with other cold outreach tools?
Maildoso's GPA of 1.4 is higher than 0 of the 47 other cold outreach tools we grade, and level with 2.
Is Maildoso good value for money?
ToolGPA grades Maildoso D for value for money. Its paid plans start at $75 a month, against a middle price of $39 for the category: 39 of the 43 others that charge start lower.
Could I make my own version of Maildoso?
What Maildoso does at its core is plain work, and that is the kind of thing an AI app builder makes well.
Where this guide comes from
The prices, plans, platforms and features were read from Maildoso’s own pages on Nov 12, 2026, and the grades were given on Nov 12, 2026. Graded from this listing, whose facts were read from Maildoso's own pages on 12 November 2026. Not based on using the product, and shorter than our full reviews.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by BacklinkSwappers, inc. Prices change, so check maildoso.ai before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
5,038
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
5,038
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Maildoso, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/maildoso
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Maildoso: The Insider's Guide", checked Nov 12, 2026. https://toolgpa.com/tools/maildoso
Know someone choosing between cold outreach tools?
Send them this guide: toolgpa.com/tools/maildoso/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded cold outreach tools after Maildoso, each with an Insider's Guide of its own.
- Cold Outreach Insider's GuideEvery one of the 48 cold outreach tools we grade, compared
- lemlist Insider's GuideCold email and LinkedIn sequences with a built-in lead database2.8 GPA
- Salesforge Insider's GuideCold email and LinkedIn sequences with AI-written messages2.8 GPA
- Saleshandy Insider's GuideCold email sequences with a B2B lead database in every plan2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Maildoso’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Maildoso is a trademark of its owner, and this guide is not made, paid for or approved by BacklinkSwappers, inc. Prices and plans change: check maildoso.ai before you buy.