6 Best Maildoso Alternatives in 2026 [Compared & Tested]

If you are looking for Maildoso alternatives, you probably already have a reason.

Maildoso is popular cold email infrastructure due to its low mailbox prices. It offers SMTP mailboxes, official Google Workspace mailboxes, or both, and handles the DNS setup for you.

However, like any platform, Maildoso has some limitations. Here are some of the problems I’ve seen or heard people discuss on G2, Reddit, and other review platforms.

• Domains are available only with quarterly plans, so you need to commit to a longer billing period.
• Some reviewers on G2 and Reddit have reported lower email deliverability.
• SMTP mailboxes have a limit of 15 emails per mailbox per day, which limits how much you can send from each mailbox.
• Maildoso does not offer pre-warmed email accounts, so you need to warm up your mailboxes separately.
• Microsoft 365 mailboxes are not available if you need them for your setup.
• Some G2 and Trustpilot users report slow setup and limited reporting, especially as they scale.

I have worked with cold email setups using shared pools, dedicated IPs, and Google and Microsoft mailboxes for years.

Below is every alternative to Maildoso worth considering for cold outreach, including providers with shared IP infrastructure, dedicated IPs, pre-warmed accounts, and Google or Microsoft mailboxes.

TL;DR: 6 Best Maildoso Alternatives in 2026

• Best for affordable shared infrastructure: Mailforge offers shared email infrastructure with pre-warmed mailboxes and complete control over your DNS configuration.
• Best for Google Workspace and Microsoft 365: Primeforge offers genuine Google Workspace and Microsoft 365 mailboxes for sending from familiar providers.
• Best for dedicated email infrastructure: Infraforge gives you dedicated servers and IPs, keeping your sending reputation separate from other customers.
• Best for fast mailbox setup: Zapmail sets up Google Workspace and Microsoft 365 mailboxes in about five minutes, including automatic DNS configuration.
• Best for unlimited Microsoft Azure inboxes: Inframail lets you add unlimited Microsoft Azure inboxes under a single monthly plan without extra mailbox costs.
• Best for bulk SMTP inbox setup: Mailscale lets you create SMTP inboxes in bulk, with plans supporting up to 15, 50, or 200 inboxes.

My Criteria for a Maildoso Alternative

I evaluated every provider using the same seven questions rather than scoring them on feature counts.

1. How quick and easy is the setup?
2. Does the platform help you achieve good email deliverability?
3. Does scaling to more mailboxes stay affordable?
4. Does it automate DNS and other setup, or do I need to configure everything myself?
5. Does it support MCP or CLI for managing mailboxes and infrastructure?

These questions helped me compare each provider based on how it works in practice.

6 Top Maildoso Alternatives Compared at a Glance

The table below gives you a quick side-by-side comparison of each provider. Scroll sideways to see every column.

1. Mailforge: Best for Affordable Shared Cold Email Infrastructure at Scale

Best for: GTM teams and agencies that need affordable mailboxes and shared cold email infrastructure for cold email outreach at scale.

Mailforge is a cold email infrastructure platform that lets you create mailboxes across multiple domains on a shared IP pool. You can set up hundreds or thousands of mailboxes without managing each one manually.

If you are comparing it with Maildoso, the biggest differences are pricing, pre-warmed mailboxes, and how much control you have over your domains and infrastructure.

Here are the main differences:

1. Lower mailbox costs: Plans start at $3 per mailbox per month and drop to $2 with annual billing. You can pay monthly or annually instead of committing to a quarterly plan.
2. Pre-warmed mailboxes: Pre-warmed mailboxes cost the same as standard mailboxes, so you can start sending from day one. With Maildoso, you need to warm up your mailboxes yourself before sending cold emails.
3. More control through MCP and CLI: You can manage domains, DNS records, and mailboxes through scripts instead of setting everything up manually. Mailforge also works with the sending tool you already use.

Plus, now you can bring your domains to Mailforge for free and only pay for the mailboxes you create.

Choose Mailforge if you need to set up a large number of mailboxes while keeping infrastructure costs low and retaining control over your domains.

Key Features of Mailforge

• Bulk Domain and Mailbox Creation: Create mailboxes across multiple domains in minutes. Mailforge also helps calculate how many mailboxes you need based on your setup.
• Pre-Warmed Mailboxes: Start sending from pre-warmed mailboxes on day one without paying more than you would for standard mailboxes.
• Automated DNS: Set up SPF, DKIM, and DMARC automatically, then push bulk DNS updates across multiple domains in just a few clicks.
• Domain Flexibility: Add your own domains, buy domains through the platform, or transfer them out when needed.
• Client Workspaces: Keep each client's domains and mailboxes in separate workspaces and move them between workspaces as projects change.
• Domain Masking: Use a branded website without exposing your main domain. SSL and domain masking are available as an add-on.
• Sending Tool Integrations: Connect Mailforge with your existing sending tool. The native Salesforge integration also lets you skip the manual export step.
• MCP and CLI: Manage domains, DNS records, and mailboxes through Claude, Cursor, or your own agents using scripts, with no manual setup per mailbox.

Pros and Cons of Mailforge

Pros

• Competitive pricing, with among the lowest published per mailbox cost for managed email infrastructure
• Pre-warmed mailboxes cost the same as standard ones
• Full DNS control with bulk updates across hundreds of domains
• Workspaces keep client setups genuinely separate
• Domains transfer in and out freely, so nothing locks you in
• Native Salesforge integration removes the CSV step
• MCP and CLI access, so you can set mailboxes up by script

Cons

• The platform only offers shared cold email infrastructure

Mailforge Pricing

Prices below run on annual billing and drop as volume climbs.

2. Primeforge: Best for Google Workspace and Microsoft 365 Mailboxes

Best for: GTM teams and agencies that want genuine Google Workspace and Microsoft 365 mailboxes for cold email.

Primeforge is one of the go-to options for cold email infrastructure. It gives you actual Google Workspace and Microsoft 365 mailboxes. It also takes care of the setup, including SPF, DKIM, DMARC, and other DNS records for your domains.

If you are comparing it with Maildoso, the biggest differences are the mailbox providers, pre-warmed mailboxes, and how you manage your accounts.

Here are the main differences:

1. Google Workspace and Microsoft 365: Primeforge gives you both options. Maildoso offers Google Workspace but does not offer Microsoft 365.
2. Pre-warmed mailboxes: Primeforge offers pre-warmed mailboxes on your own domains. You can start sending from day one without warming them yourself.
3. API, MCP, and CLI access: You can create and manage mailboxes in batches. You do not have to set up each mailbox one at a time.
4. Sending tool support: You can connect your Primeforge mailboxes to Salesforge or other sending tools.

Plus, now you can bring your domains to Primeforge for free and only pay for the mailboxes you create.

Choose Primeforge if you want actual Google Workspace or Microsoft 365 mailboxes and need to manage them at scale.

Key Features of Primeforge

• Google Workspace and Microsoft 365: Send from actual Google Workspace and Microsoft 365 mailboxes.
• Pre-Warmed Mailboxes: Start sending from pre-warmed mailboxes instead of warming them yourself.
• Automated DNS: Primeforge sets up SPF, DKIM, and DMARC for your domains.
• Profile Branding: Add profile pictures and other sender details to your mailboxes.
• Client Workspaces: Keep mailboxes organized by client or project.
• Sending Tool Integration: Connect Primeforge mailboxes to Salesforge or other sending tools.
• Primeforge API: Create and manage mailboxes through the API.
• MCP and CLI: Manage your complete cold email infrastructure through MCP and CLI.

Pros and Cons of Primeforge

Pros

• Real Google and Microsoft accounts rather than in-house SMTP
• Pre-warmed mailboxes remove the two-to-four week wait
• ESP matching, which helps you land in the primary inbox rather than the spam folder
• API, MCP and CLI access on every account, not gated to a top tier
• Profile branding handled out of the box

Cons

• It has only offers Google Workspace and Microsoft-365 mailboxes, so you don't get dedicated or SMTP mailboxes

Primeforge Pricing

Prices below run on annual billing and drop as volume climbs.

3. Infraforge: Best for Dedicated Email Infrastructure

Best for: High-volume outbound agencies and GTM teams that need private email infrastructure with dedicated IPs.

Infraforge is a private email infrastructure provider. It gives you dedicated servers and IPs for your cold email setup.

If you are comparing it with Maildoso, the biggest difference is how the infrastructure is shared. Maildoso uses shared infrastructure, while Infraforge gives you private infrastructure for your mailboxes.

Here are the main differences:

1. Dedicated IPs: Your sending infrastructure uses dedicated IPs instead of sharing them with other senders.
2. Separate infrastructure: You can keep different clients, domains, or campaigns on separate infrastructure. This helps isolate their sending activity from each other.
3. More control: You have more control over your email infrastructure, including the domains, mailboxes, and IPs you use.
4. API, MCP, and CLI: You can manage your domains, mailboxes, and infrastructure in batches instead of setting everything up manually.

Infraforge also automates SPF, DKIM, and DMARC setup for your domains. You can connect it to Salesforge or other sending tools and manage the infrastructure from one place.

Plus, now you can bring your domains to Infraforge for free and only pay for the mailboxes you create.

Choose Infraforge if you run high-volume cold email campaigns and want dedicated infrastructure for your domains and mailboxes.

Key Features of Infraforge

• Dedicated IPs: Run every mailbox on dedicated servers with its own dedicated IP address, so sender reputation and email reputation stay under your control.
• Pre-Warmed Mailboxes: Send on day one instead of waiting two to four weeks.
• Multiple IPs: Split clients or email campaigns across separate IPs so each keeps its own IP reputation.
• Unlimited Mailboxes: Create unlimited email accounts across multiple domains, with SPF, DKIM and DMARC configured automatically.
• Bulk Generators: Create domains in one click and inboxes in batches.
• Live Monitoring: Track inbox health with blacklist monitoring and live alerts, so deliverability optimization happens before a domain burns.
• White Label: Rebrand the whole product and run it under your own name, with a support team behind it.
• API and CLI: Control mailboxes, domains and IPs from your own code or from Claude and Cursor.

Pros and Cons of Infraforge

Pros

• Dedicated IPs keep your sending record out of a shared IP system
• Separate IPs keep clients and campaigns apart
• Pre-warmed mailboxes available for day-one sending
• Real-time monitoring catches issues before a domain burns
• White-label option for agencies and resellers

Cons

• There is no free trial for mailboxes, but you can sign up and explore the platform

Infraforge Pricing

4. Zapmail: Best for Fast Pre-Warmed Inboxes

Best for: Teams that want Google or Microsoft mailboxes live within minutes.

Zapmail is a cold email infrastructure provider that offers Google Workspace and Microsoft 365 mailboxes. It buys the domains, creates the mailboxes, and handles the basic DNS setup for you.

You can get a batch of mailboxes ready in about five minutes, with SPF, DKIM, and DMARC already configured. Zapmail also offers pre-warmed accounts if you want to start sending without waiting for the warmup process.

The main thing to keep in mind is how Zapmail's pre-warmed accounts work. They come with separate and more expensive plans. They also use domains owned by Zapmail instead of your own domains.

Choose Zapmail if you want to get your mailboxes ready quickly and do not need to own the domains yourself.

Key Features of Zapmail

• Provider Mailboxes: Buy Google Workspace and Microsoft 365 accounts rather than an in-house SMTP setup.
• Fast Setup: Get multiple email accounts live in about five minutes with automated setup of DNS already done.
• Pre-Warmed Accounts: Skip the warmup wait, on separate plans and on Zapmail's own domains.
• Domain Purchase: Let Zapmail buy and configure the domains alongside the mailboxes.
• Wide Export: Push mailboxes to more than 50 sending tools.

Pros and Cons of Zapmail

Pros

• Real Google Workspace and Microsoft 365 accounts
• Among the fastest setup times in this comparison
• Pre-warmed accounts available for day-one sending
• Domains bought and configured for you
• Exports to more than 50 sending tools

Cons

• Pre-warmed accounts only run on Zapmail's own domains, not yours
• API access requires the $299 Pro plan
• A strict no refund policy, so the entry plan is your only real test
• You cannot import mailboxes you already own
• Some reviewers report the Google accounts come from India-based resellers

Zapmail Pricing

5. Inframail: Best for Unlimited Microsoft Azure Inboxes

Best for: Agencies that add mailboxes faster than they add sending volume.

Inframail is a cold email infrastructure provider with a flat monthly fee. It gives you unlimited Microsoft Azure inboxes, so you can add more inboxes without increasing your monthly cost.

Both plans include a dedicated IP and free domains. These are included in the monthly plan, so you do not need to pay for them separately.

If you are comparing it with Maildoso, the biggest difference is how the pricing works. Inframail charges a flat monthly fee based on the plan you choose. The number of inboxes you create does not change the price.

The main thing to keep in mind is the monthly sending limit. Inframail limits the number of emails you can send each month. Your sending volume becomes the main limit as you scale.

Choose Inframail if you need a large number of Microsoft Azure mailboxes and plan to send a moderate volume of emails each month.

Key Features of Inframail

• Unlimited Inboxes: Create unlimited email accounts on Microsoft Azure for one flat platform fee.
• Dedicated IPs: Send from 1 dedicated IP on the Unlimited plan, or 3 on Agency Pack.
• Free Domains: Get 10 domains on Unlimited and 20 on Agency Pack at no extra cost.
• Automated DNS: Set up SPF, DKIM and DMARC automatically, then export credentials by CSV.
• API Access: Manage inboxes from your own code on both plans, with multiple users supported.

Pros and Cons of Inframail

Pros

• Flat pricing keeps forecasting simple as client count grows
• Dedicated IPs come with the plan rather than as an add-on
• Free domains on both tiers
• API access on both plans
• Unlimited inboxes, so headcount never moves the bill

Cons

• Microsoft Azure only, so you get no Google Workspace option at all
• Warmup costs extra and has to run through your sending tool
• Reviewers note that Inframail does not publish the IP origin or age
• The $129 entry price bites below about 40 mailboxes

Inframail Pricing

6. Mailscale: Best for Bulk SMTP Inbox Setup

Best for: Teams scaling past 50 inboxes who want a fixed monthly cost.

Mailscale is a cold email infrastructure provider with its own SMTP servers and IP pools. It lets you create inboxes in bulk and handles the DNS setup for you. Once the setup is complete, you receive a CSV file that you can import into your sending tool.

If you are comparing it with Maildoso, Mailscale gives you more options for bulk SMTP inbox setup. It offers plans for up to 15, 50, or 200 inboxes, with Enterprise plans available for larger setups.

Mailscale also advertises a deliverability guarantee for its professional inboxes. The company states that it guarantees 95% to 100% deliverability.

The pricing uses fixed tiers, so you need to choose a plan based on the number of inboxes you need.

Choose Mailscale if you need bulk SMTP inboxes with DNS setup and infrastructure managed for you.

Key Features of Mailscale

• Bulk Creation: Generate 50 or more inboxes in under a minute rather than setting them up one at a time.
• Automated DNS: Get SPF, DKIM and DMARC configured on every domain at purchase.
• Domain Purchase: Purchase domains inside the platform at around $10 to $15 a year each.
• CSV Export: Import your finished email accounts into Instantly, Smartlead or any standards-compliant sending tool before you launch campaigns.
• Own Domains: Connect domains you already own, at a reported $2 per domain.

Pros and Cons of Mailscale

Pros

• The lowest effective per-inbox rate in this comparison at the top tier
• Bulk creation of 50 or more inboxes in under a minute
• DNS configured on every domain at purchase
• Domains available inside the platform at $10 to $15 a year
• Works with any standards-compliant sending tool

Cons

• Shared IP SMTP rather than real Google Workspace accounts or Microsoft inboxes
• Tier boundaries are coarse, so one extra inbox can jump your bill
• Warmup is not included and has to run through your sending tool
• Its published deliverability guarantee carries no stated methodology
• Pricing sources disagree on the Business plan rate

Mailscale Pricing

How to Choose Cold Email Infrastructure

A cold email infrastructure platform gives you the domains and email accounts you send from. Outreach platforms handle campaign management and sequencing. You need both, but they serve different purposes. No single cold email infra product covers your whole outreach efforts.

Cold email marketers running email outreach often compare providers on price alone. Cold emailers who have burned a domain tend to weigh mailbox type and sending limits higher, because those decide where your email lands.

Run your shortlist through these before you pay anyone.

1. Are these real Google or Microsoft accounts, or basic sending addresses described as mailboxes?
2. Does warmup come with the product, cost extra, or land on you entirely?
3. What is the daily send limit per mailbox, and how many inboxes does your volume actually need at that limit?
4. What does the bill reach at 30, 70 and 300 mailboxes once you count add-ons?
5. Do you own the domains, and can you move them out?
6. Does the pricing step in tiers, and does your inbox count land near a boundary?
7. Can you move to dedicated IPs if the shared pool stops working for you?
8. Do you get IP rotation and inbox placement monitoring across major email providers, or do you buy that separately?
9. Does the vendor publish a refund or replacement policy?
10. Can you match your prospect's email provider, or do you send the same way to everyone?

The last one catches more teams than any other. If your list runs half Microsoft and all your mailboxes are SMTP, you fight spam filters on every send and end up in the spam folder rather than the primary inbox.

Price per mailbox matters less than the send limit behind it. A $2 mailbox capped at 15 emails a day needs two or three times the headcount of a $3 mailbox that safely sends 30 to 50.

Which Maildoso Alternative Should You Choose?

After going through these Maildoso alternatives, two options stand out for different needs: Mailforge and Primeforge.

Mailforge is a good fit if you want to set up a large number of mailboxes on shared infrastructure. You can also use pre-warmed mailboxes and manage your domains and DNS from one place.

Primeforge is a better fit if you want Google Workspace or Microsoft 365 mailboxes. It also offers pre-warmed mailboxes and gives you ways to manage accounts in bulk.

Both options work with your existing sending tools. The choice comes down to the type of mailboxes and infrastructure you need for your cold email campaigns.

Teams needing fewer than 10 mailboxes should check the minimum slot count first. Teams that want more advanced features, such as dedicated IPs or white labelling, should look at Infraforge instead.

Frequently Asked Questions

1. What is the best Maildoso alternative?

Mailforge is the best Maildoso alternative for most teams, because it holds per-mailbox costs between $3 and $2, charges the same rate for pre-warmed mailboxes, and gives you full DNS control. If mailbox quality is your reason for leaving, Primeforge offers real Google and Microsoft accounts at $4.50 to $3.50 per mailbox. If you need dedicated IPs, Infraforge runs $4 to $3.

2. How much do Maildoso alternatives cost?

Cold email mailboxes in this comparison run from about $1.25 to $4.50 per mailbox per month, and the per inbox cost drops as volume climbs. Mailforge costs $3 to $2, Infraforge $4 to $3, and Primeforge $4.50 to $3.50, all billed annually. Flat-rate options like Inframail start at $129 a month whatever your inbox count, so count warmup and domain costs before you compare.

3. Why do people look for Maildoso alternatives?

The 15-email daily limit on SMTP mailboxes is the most common reason, because it forces you to buy far more mailboxes for the same volume. The other reasons are the lack of pre-warmed accounts, no Microsoft 365 option, and domains that require a quarterly plan. Some G2 and Trustpilot reviewers also report slow setup and limited reporting as they scale.

4. Do I need pre-warmed mailboxes, or can I warm them myself?

You need pre-warmed mailboxes only if you cannot wait two to four weeks before sending. These are two different things. A pre-warmed mailbox arrives ready to send, while a warmup tool like Warmforge warms a standard mailbox for you over those weeks, at $9 per slot standalone or included with a Salesforge subscription. On Mailforge both mailbox types cost the same, so the wait is the only real difference.

5. How many mailboxes do I need to send 10,000 emails a month?

Around 10 to 15 mailboxes, based on a safe ceiling of 30 to 50 emails per mailbox per day. That maths changes fast on providers with lower daily caps. Maildoso's SMTP mailboxes allow 15 emails a day, so the same 10,000 emails a month need roughly 23 mailboxes instead.