Maildoso Review: Here’s Our Experience With 30 SMTP Accounts

If you’re planning to start using Maildoso, you’re likely wondering what it’s really like once sending begins. 

To answer that, we tried Maildoso with 30 SMTP mailboxes and paid attention to the everyday details that matter, like:

• How many emails each mailbox can send per day? 
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• How it handles deliverability, and how everything looks when you run many accounts at the same time.

Read this complete review to decide if Maildoso fits your setup before committing.

Key Takeaways

• Maildoso is an email infrastructure tool built for outbound, designed to let you combine SMTP and Google Workspace mailboxes in one dashboard to diversify sending infrastructure.
  
  
• Each Maildoso mailbox comes with a fixed daily sending limit, so increasing volume means adding more mailboxes, not raising limits on existing ones.
  
  
• Deliverability insight in Maildoso is limited to basic health checks. It does not clearly provide deep diagnostics like detailed inbox vs spam tracking, ESP-level placement results, or long-term mailbox performance trends.
  
  
• DNS and domain handling in Maildoso can feel restrictive if you want more control or flexibility while scaling infrastructure.
  
  
• Mailforge is often preferred by teams that want to scale mailbox infrastructure cleanly, with simpler setup and clear per-mailbox pricing.

What Is Maildoso?

Maildoso is an outbound email infrastructure tool that helps you create and manage SMTP and Google Workspace mailboxes for cold email.

It lets you manage everything from one dashboard.

You can register new domains or connect your own, create mailboxes, and set up SPF, DKIM, and DMARC from the same place.

Maildoso supports SMTP mailboxes, Google Workspace mailboxes, and a combo option where both can be used together. 

 You can connect mailboxes directly to platforms like Instantly, Smartlead, Saleshandy, and others.

It also includes features like domain tracking, mailbox management, API access for automation, and deliverability-related resources, all focused on running cold email at scale in a structured way.

Use Mailforge! Create, manage, and scale cold email mailboxes without inbox limits.

Maildoso Sending Limits, Warm-Up Logic, and Ramp-Up Rules

Maildoso controls sending using fixed daily limits and predefined warm-up rules per mailbox.

Per-mailbox daily send caps

When we checked the sending limits, Maildoso kept things very clear at the mailbox level.

Each SMTP mailbox comes with a hard limit of 95 emails per day.

This limit is fixed per account, so every mailbox follows the same rule.

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How warm-up volume is split from live prospecting

Out of those 95 daily emails, Maildoso separates domain warm-up and prospecting.‍

80 emails are used for warm-up, and 15 emails are allowed for live prospecting.

This split is already defined, so there’s no need to decide how much goes where.

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Recommended warm-up timelines for new domains

For new mailboxes and domains, Maildoso recommends running a warm-up for 10 to 14 days.

During this period, warm-up runs continuously while prospecting stays limited to the allowed volume.

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How Maildoso controls gradual sending increases

While using the platform, we saw that warm-up volume increases are kept gradual.

Maildoso allows warm-up emails to go up by 1–2 emails per day, rather than letting volumes jump suddenly.

This keeps sending activity steady as the mailbox ramps up over time.

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How Maildoso Handles Deliverability and Inbox Protection

Maildoso manages deliverability by controlling how emails are sent, protected, and monitored at the infrastructure level, rather than leaving these settings to individual inboxes.

Here is what Maildoso provides to manage deliverability:

ESP-managed SMTP, IP rotation, and sending pools

• All emails are sent through Maildoso’s own ESP and SMTP servers, so sending is handled inside the platform.
  
  
• IP rotation runs automatically in the background, without needing any extra setup.
  

CAPTCHA and abuse protection on primary domains

• Maildoso keeps the primary domain protected behind CAPTCHA.
  
  
• This helps prevent bots and scanners from connecting the main domain with outbound domains.

Access to deliverability guidance and hands-on support

• Maildoso provides deliverability consulting support when issues come up.
  
  
• This includes reviewing campaigns, running deliverability tests, and checking email copy.

Visibility into inbox placement and sending performance

• Maildoso gives access to sending performance data, including open and reply rates.

How Maildoso Supports Automation with API Access

Maildoso includes an API for teams that want to automate mailbox and domain setup instead of managing everything manually from the dashboard.

Below is how the API is used in practice:

API access and what it covers

Maildoso provides an API that can be used to connect the platform with other tools.

It helps automate mailbox-related actions so repeated setup steps don’t have to be done from the dashboard.

Automating mailbox and domain setup

With the API, mailboxes can be created automatically.

This is useful when setting up many mailboxes at once and keeping the process consistent.

Using Maildoso with other systems

Maildoso can be connected to CRMs, outreach tools, or custom systems through the API.

This allows Maildoso to work as part of a larger outbound workflow without manual intervention.

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How Maildoso Connects With Your Outbound and Outreach Tools

Maildoso is used to set up and manage domains and mailboxes, while your outreach tool handles campaigns and sending, so both work together without changing your existing workflow.

Tools you can connect Maildoso with

Maildoso supports direct integrations with tools like Instantly, Smartlead, Saleshandy, EmailBizon, and other similar platforms.

How the connection works 

Mailboxes are connected using a one-click sync.
Once you do that, the mailboxes are mapped automatically inside the outreach tool, so there’s no need to download files or import accounts manually.

How Maildoso fits into your outbound setup

Maildoso is used to set up and manage domains and mailboxes.

Your outreach tool is then used to create campaigns and send emails.

This way, Maildoso fits into your existing outbound stack without changing how you already work.

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Maildoso Pricing Breakdown for SMTP and Mailbox Infrastructure

Quarterly SMTP plan

Maildoso offers 3 quarterly SMTP plans. They include 32, 68, or 400 SMTP mailboxes, come with 8, 17, or 100 domains, and cost $299, $499, or $2,199 per quarter.

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Monthly SMTP plan

Monthly SMTP plans start from 20 mailboxes at $50/month, scale to 50 and 200 mailboxes, and go up to 10,000+ mailboxes with custom pricing.

Each plan includes only SMTP mailboxes, with domains recommended based on mailbox count.

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Combo plans: SMTP + Google Workspace 

Maildoso has 3 combo plans that include 20, 50, or 200 total mailboxes.

Each plan splits mailboxes between SMTP and Google Workspace and costs $50, $113, or $380 per month.

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Google Workspace–only plans

There are 3 Google Workspace plans with 20, 50, or 200 mailboxes, priced at $65, $150, or $500 per month.

These plans include official business-licensed Google accounts and require a set number of domains.

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Practical Limitations of Maildoso

• Deliverability visibility is limited to health scores and basic checks, not full IP-level or routing-level diagnostics.
  
  
• Each mailbox has a hard daily sending limit of 95 emails per day, and only a portion of that is for prospecting.
  
  
• SMTP setups can be difficult to manage at scale, because poor sending behavior from some users can create a domino effect that impacts deliverability for other users on the same infrastructure.

• DNS control is limited, which can make it harder to connect Maildoso domains with other tools or services outside the platform.

• Domain replacements may use non-standard extensions like .xyz or .click instead of .com, which some users find less suitable for outreach.

• Maildoso is built only for B2B cold email. Sending high volumes to free email providers like Gmail or Yahoo can lead to account suspension.

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Mailforge: Maildoso Alternative for Scaled Mailbox Infrastructure

Mailforge is a cold email infrastructure tool made to set up and manage domains and mailboxes for outbound, using a distributed shared-IP system.

Compared to Maildoso, it focuses on a simpler setup and easier scaling when mailbox numbers grow.

Faster Setup With Less Effort

Mailforge sets up domains and mailboxes in minutes using automated DNS.

You don’t need to manually configure SPF, DKIM, or DMARC for every domain, which removes a lot of setup work compared to SMTP-based systems.

Distributed Shared-IP Infrastructure

Mailforge runs mailboxes on a shared IP pool, similar to how Gmail or Outlook work.

This means you’re not managing individual SMTP IP limits or worrying about warming each IP separately.

Unlimited Mailbox Creation Support

Mailforge supports unlimited mailbox creation with bulk DNS updates.

This makes scaling straightforward, without hitting strict per-mailbox caps or repeating setup steps for every new inbox.

Extra Domain Protection Options

Mailforge includes SSL and domain masking options.

These help protect domains as outbound volume increases and add an extra layer between your sending domains and public access.

Works With Any Sending Tool

Mailforge handles only the infrastructure layer. You can use it with Salesforge or any other outreach tool, without changing how you run campaigns or manage replies.

Clear, Per-Mailbox Pricing

Mailforge pricing is simple and predictable, ranging from $3 to $2 per mailbox per month, with setup and maintenance included.

As you add more mailboxes, costs scale in a clear and easy-to-track way.

If Maildoso feels limiting as you scale with SMTP rules and per-mailbox caps, Mailforge offers a more flexible setup that’s easier to grow with larger mailbox volumes.

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Conclusion

Maildoso can work well if you’re planning to run cold email using SMTP mailboxes and are comfortable operating within fixed daily limits, warm-up rules, and structured domain control.

That setup can feel controlled and predictable, but it can also start to feel limiting as you add more mailboxes and volume. 

Mailforge makes scaling easy, with a simpler setup, fewer operational constraints, and clear per-mailbox pricing. 

If your goal is to scale outbound with less manual handling and fewer moving parts, that difference in approach is worth considering before you commit long-term.

Start building your cold email infrastructure with Mailforge and scale your mailboxes without the usual SMTP limits.

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