Mailscale vs Maildoso: Which Email Infrastructure Is The Right Choice?

I have set up cold email infrastructure on both shared-pool providers and dedicated-IP providers. The difference between them shows up between week two and week four. That is exactly when you have already committed budget and contacts to a campaign.

Mailscale and Maildoso both compete at the cheap end of the market. They advertise low per-inbox cost and fast setup. But "per inbox" hides what you are actually buying. Both run your sending through shared IP pools, where other customers influence the reputation you send on.

Infraforge takes the other path: dedicated IPs, isolated sender fingerprints, and a per-mailbox price that does not jump between tiers. This post compares all three on infrastructure model, deliverability, pricing at scale, and what happens when a campaign goes wrong.

Cold Email Infrastructure Comparison at a Glance: Mailscale vs Maildoso

Here is how the three providers line up on the dimensions that decide a cold email setup. Every cell is a specific, checkable fact, not a vague label.

Mailscale Overview: Shared-IP SMTP Infrastructure

Mailscale is a self-hosted email infrastructure platform. Instead of reselling Google Workspace or Microsoft 365, the team runs its own SMTP servers and IP pools. It provisions cold outreach inboxes in under 60 seconds. The product targets solo operators and agencies who want fast setup and a fixed monthly bill.

The homepage pitch is simple: spin up 50 inboxes in under a minute, plug them into Instantly or Smartlead, and start sending. Mailscale handles the DNS, owns the servers, and offers a 95-100% deliverability guarantee on Google and Outlook recipients.

Core features

• Self-hosted SMTP servers - Mailscale owns its full stack, including SMTP servers and IP pools, rather than renting from Microsoft or Google.
• Automated DNS setup - SPF, DKIM, and DMARC are configured automatically when you add or buy a domain inside the platform.
• Bulk inbox generation - Generate up to 200 inboxes in one form submission and export them as a CSV.
• Sequencer-agnostic - Plugs into Instantly, Smartlead, Apollo, Reply, Lemlist, Mailshake, or any IMAP/SMTP tool.
• 95-100% deliverability guarantee - Mailscale replaces burned domains free if inbox placement drops below 80%.
• Included cold email course - The Business and Enterprise plans bundle training material.

Pricing

Mailscale uses fixed tiers, not per-mailbox pricing:

• Solopreneur: $79/mo for up to 15 inboxes ($63/mo billed annually).
• Business: $119/mo for up to 50 inboxes ($95/mo billed annually).
• Enterprise: $249/mo for up to 200 inboxes ($199/mo billed annually). Extra inboxes beyond 200 cost $1.50 each.
• Unlimited: $1,000+/mo with dedicated IPs, a self-healing mechanism, and a dedicated deliverability specialist. Application-only.

Domains bought inside Mailscale run about $10-$15/year per .com. You can bring your own domain for $2 extra, but Mailscale will not guarantee deliverability on bring-your-own domains. A 7-day free trial is available. If you want a wider view of budget options, I keep a running list of cheap inboxes for cold email.

Who Mailscale fits

Solo operators and small agencies who want fast setup, a fixed bill, and a sequencer-agnostic SMTP product. The 95-100% guarantee is the strongest selling point. The bundled cold email course makes it appealing to first-time outbound operators.

What reviewers say

The tier-break math is the most-flagged pricing issue. If you need 16 inboxes you pay $119/mo, the same as someone running 50. If you need 51 inboxes you pay $249/mo, the same as someone running 200. Crossing a tier costs a $40-$130 monthly step.

Deliverability over longer windows is the bigger concern. Mailscale's TrustScore sits around 4.1 across roughly 88 reviews, and the critical ones cluster on the same theme. The 1-star review above reports inbox placement below 50% by week two, a data-center and IP move that did not fix it, and support taking 3-5 days to respond. That pattern is the shared-pool risk in practice: your reputation is partly set by every other Mailscale customer on the same IPs. The recovery guarantee covers documented drops, but you still lose weeks of pipeline while domains get replaced.

Maildoso Overview: SMTP and Google Workspace Mailboxes

Maildoso is a cold email infrastructure provider that sells two products. The first is SMTP mailboxes on its own shared infrastructure with IP rotation. The second is real Google Workspace mailboxes on isolated workspaces, one domain per workspace. The Google Workspace product targets senders who reach Gmail, Outlook.com, and Yahoo recipients, where SMTP placement tends to be weaker.

The SMTP product is the budget anchor. At 300 mailboxes you pay $1.90 per mailbox per month. The homepage cites 10M+ emails sent per day, 400k+ mailboxes managed, and a 4.7 G2 rating.

Core features

• SMTP mailboxes - Own infrastructure with IP rotation across multiple IPs per campaign.
• Google Workspace mailboxes - Real Google Workspace accounts, one domain per isolated workspace.
• Auto-configured DNS - SPF, DKIM, and DMARC handled automatically; mailboxes ready in about 15 minutes.
• Master inbox - Centralizes incoming replies across all mailboxes in one view.
• Self-healing mailboxes - Maildoso pauses burned mailboxes for 14 days to recover, then returns them to rotation.
• GCDT link safety - Lets you include links in the first email without burning deliverability, per Maildoso's product page.
• API access - Programmatic mailbox management.

Pricing

Maildoso splits pricing across three tracks. SMTP monthly plans:

• 30 mailboxes: $75/mo ($2.50/mailbox).
• 70 mailboxes: $158/mo ($2.25/mailbox).
• 300 mailboxes: $570/mo ($1.90/mailbox).

Combo plans mix SMTP and Google Workspace: 15 GW + 15 SMTP at $90/mo (6 domains), 35 + 35 at $175/mo (14 domains), and 150 + 150 at $675/mo (60 domains). Quarterly SMTP plans are cheaper per mailbox but need a 3-month commitment: 32 mailboxes at $299/quarter, 68 at $499/quarter, and 400 at $2,199/quarter, with domains included. Monthly plans charge domains separately at about $12/year. There is a 30-day money-back guarantee on quarterly plans and no free trial.

Who Maildoso fits

Senders who specifically need to reach personal inboxes (Gmail, Outlook.com, Yahoo) and want real Google Workspace mailboxes mixed with cheaper SMTP under one bill. The combo plans are the most cost-effective way to pair Google Workspace with SMTP at scale.

Known limitations

Maildoso reviews are split. The G2 page averages 4.6 across 160-plus reviews, and the positive ones praise the 10-15 minute setup, the master inbox, and the API. The recurring criticisms are specific: reviewers report burned domains on cheaper TLDs like .xyz and .click, poor deliverability on those domains, and SURBL blocklisting events that forced campaign pauses for days. Support draws mixed notes too: fast at onboarding, slow at incident response, with G2 reviewers describing weeks-long waits on open issues. DNS control is limited, so connecting your own domains is not always flexible.

Maildoso's own position is fair to note: the team says most "burned domain" complaints trace back to dirty lists driving high bounce rates, not infrastructure failure, and that is often true. But the shared SMTP infrastructure still means other customers' sending influences your reputation. As of early 2026, Maildoso does not offer an enterprise plan with isolated infrastructure, which is a real gap for agencies and high-volume teams.

Infraforge Overview: Private Dedicated-IP Infrastructure

Infraforge is the private email infrastructure product inside the Forge Stack. Each subscription gets dedicated IPs, isolated sender fingerprints, and full control over the technical setup. The product is built for cold outreach specifically, not retrofitted from a marketing tool or a transactional ESP.

Core features

• Dedicated IPs on every account - Your reputation is yours alone, not pooled with thousands of other senders.
• Automated DNS setup - SPF, DKIM, DMARC, and custom domain tracking configured for every domain you add.
• Pre-warmed domains and mailboxes - Skip the 2-week warm-up window and start sending on day one.
• Multi-IP provisioning - Buy additional dedicated IPs at $99/IP/month to spread sending and protect reputation.
• SSL & domain masking - $2/domain/month to show a branded site without exposing your primary domain.
• Masterbox - $7-9/workspace/month to see every email across every mailbox in one view.
• Multiple workspaces - Keep each client or project isolated and move domains between them.
• Bulk DNS updates - Update records across hundreds of domains in a few clicks.
• Infraforge API - Programmatic control over the full infrastructure.
• Whitelabel reseller program - 20% revenue share to resell under your own brand.
• SOC 2 compliant - The full Forge Stack carries SOC 2 compliance, which matters for regulated clients.

The Forge Stack context

Infraforge runs standalone with any sequencer, or alongside the rest of the stack. That includes Mailforge for shared-IP infrastructure, Primeforge for Google and Microsoft 365 mailboxes, Warmforge for deliverability monitoring, Leadsforge for lead data, and Salesforge for sending and AI personalization. The layers integrate at the system level, so there is no middleware between them.

Pricing

Infraforge prices per mailbox, not per tier. There is no penalty for adding one more inbox than a plan allows, because there is no plan. You buy mailbox slots and pay for what you provision.

• Mailboxes: $4/mailbox/mo billed quarterly, dropping toward $3/mailbox/mo billed annually at scale (2 months free on annual).
• Minimum: 10 mailbox slots. A 10-mailbox plan is $40/mo quarterly or about $33/mo billed annually.
• Domains: .com domains at $14/year, charged once.
• Add-ons: dedicated IPs at $99/IP/month, SSL and domain masking at $2/domain/month, Masterbox at $7-9/workspace/month.

The pricing page has a calculator that sizes the infrastructure from your contacts-per-month and emails-per-sequence. If you want to size it yourself first, this guide on how many mailboxes you need for outreach covers the math.

Who Infraforge fits

Agencies running cold email for multiple clients, high-volume senders who care about reputation isolation, and operators who have outgrown shared pools. The proof point is Woodpecker, which scaled to 2,500+ mailboxes on Infraforge dedicated infrastructure. You can read the Woodpecker case study for the full setup.

Honest limitations

There is no free trial. Infraforge sells infrastructure, so trying it means buying the 10-mailbox minimum and a domain. You can explore the app without provisioning, but you cannot send before you commit. Per-mailbox pricing also costs more than Mailscale at very small scale. Fifteen inboxes on Infraforge run about $45-60/month plus domains, against Mailscale's $79 for the same count. The economics flip in Infraforge's favor between 30 and 50 mailboxes.

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Head-to-Head Feature Comparison: Mailscale vs Maildoso

Infrastructure model: dedicated vs shared

This is the single most important difference. Infraforge gives every account dedicated IPs and isolated sender fingerprints. Mailscale and Maildoso both run shared IP pools, where your reputation is influenced by every other customer on the same pool.

The shared model is fine when every customer follows best practices. It breaks when one customer sends to a dirty list, gets flagged, and drags the pool down. Mailscale monitors for blacklisting and bounces automatically. Maildoso pauses burned mailboxes for 14 days with its self-healing feature. Both are real mitigations. Neither removes the underlying fact that you do not control the IPs you send from. If you want the full trade-off, I broke it down in dedicated IPs vs shared IPs.

Setup time and DNS automation

All three automate SPF, DKIM, and DMARC. Infraforge has a first domain and mailbox live in 5 minutes. Mailscale generates 50+ inboxes in under 60 seconds after you fill out the form. Maildoso has mailboxes ready in about 15 minutes. Mailscale's 60-second claim measures only inbox creation; you still add domains and submit the form first. In practice, all three are fast enough that setup speed is not the deciding factor. What happens after the inboxes go live is.

Reputation control and pre-warming

Infraforge sells pre-warmed domains and mailboxes as a product, so you can start sending on day one without the standard 2-week warm-up. Neither Mailscale nor Maildoso sells pre-warmed inventory at the product level. The difference between buying warmth and building it is real, and I covered it in pre-warmed mailboxes vs manual warming. For ongoing monitoring, Infraforge pairs with Warmforge, which tracks a per-mailbox Heat Score, runs placement tests, and watches blacklists in real time.

Multi-IP, SSL, and advanced features

Infraforge is the only provider here that sells dedicated IP add-ons ($99/IP/month), SSL and domain masking ($2/domain/month), and a Masterbox view for unified inbox visibility. Mailscale's Unlimited plan includes dedicated IPs and a deliverability specialist, but it starts at $1,000+/month and is application-only. Maildoso offers none of these, though it hides your primary domain behind a captcha and rotates IPs.

Compliance and reseller programs

Infraforge and the wider Forge Stack carry SOC 2 compliance. Neither Mailscale nor Maildoso advertises SOC 2 on its public site as of mid-2026. For agencies serving financial services, healthcare, or legal clients, SOC 2 is often a hard procurement requirement. Infraforge also publishes a whitelabel reseller program with a 20% revenue share; the other two do not.

Sequencer compatibility

All three work with any IMAP/SMTP sequencer, so there is no lock-in on any of them. You can run Infraforge mailboxes through Instantly, Smartlead, Apollo, Reply, or Lemlist exactly as you would Mailscale or Maildoso mailboxes. The Salesforge integration is native rather than via IMAP, but that is a convenience, not a requirement. Pick the sequencer and the infrastructure separately.

Pricing Comparison at 50, 100, and 200 Mailboxes

Sticker prices mislead because each provider structures plans differently. Here is the monthly cost at three common scale points, comparing the cheapest available plan from each.

On sticker price alone, Mailscale wins at all three points and Maildoso wins at 100 mailboxes. But sticker price ignores three things.

What you are buying. Mailscale at $249/mo for 200 inboxes is shared-IP infrastructure. Infraforge at $600/mo for 200 mailboxes is 200 mailboxes on dedicated IPs with isolated fingerprints. They are not the same product. If you ask how many dedicated-IP mailboxes $249 buys on Mailscale, the answer is zero; dedicated IPs start at the $1,000+/mo Unlimited plan.

Tier-break penalties. Mailscale's tiers mean 16 inboxes cost the 50-inbox price, and 51 inboxes cost the 200-inbox price. Maildoso jumps from a 70-mailbox plan to a 300-mailbox plan with nothing in between. Infraforge has no tier breaks; you pay for the slots you provision.

Recovery cost from an incident. When a shared pool gets hit by a spam-complaint cascade, placement drops until the provider replaces domains or rebuilds reputation. That cost is measured in pipeline days, not dollars. The case studies on the Infraforge site cite 97-100% inbox placement on dedicated infrastructure, and that gap matters more than the $200/mo difference at 50 mailboxes.

Who Should Use Which Cold Email Infrastructure

You might consider Mailscale if:

• You are a solo operator running fewer than 15 inboxes and want the cheapest fixed-tier monthly bill.
• You want a 7-day free trial before paying anything.
• You value the bundled cold email course on the Business and Enterprise plans.

You might consider Maildoso if:

• You specifically need to reach personal inboxes (Gmail, Outlook.com, Yahoo) and want real Google Workspace mailboxes mixed with cheaper SMTP under one bill.
• You want a 30-day money-back guarantee on a quarterly plan.
• You are running fewer than 300 mailboxes and the shared-IP risk is acceptable for your campaign type.

Choose Infraforge if:

• You run cold outreach as a primary revenue channel and need control over your sender reputation.
• You are an agency serving multiple clients and need isolated workspaces, dedicated IPs per client, and SOC 2 compliance.
• You are scaling past 50 mailboxes, where shared-pool risk compounds and per-mailbox economics favor dedicated infrastructure.
• You want to skip the 2-week warm-up with pre-warmed domains and mailboxes.
• You want infrastructure that integrates with the rest of the Forge Stack rather than stitching tools together with middleware.

Final Verdict: Which Cold Email Infrastructure to Choose

Mailscale and Maildoso both sell shared-IP infrastructure for cold email. They work for solo operators and budget-constrained teams running short campaigns where the shared-pool risk is acceptable. Both have real strengths: Mailscale's deliverability guarantee and bundled course, Maildoso's Google Workspace combo plans for B2C-leaning sends. Neither gives you control over your sender reputation.

For private cold email infrastructure with dedicated IPs and full control over deliverability, Infraforge is the stronger choice. Every account runs on isolated infrastructure, every domain gets automated DNS setup, and per-mailbox pricing scales without tier penalties. SOC 2 compliance comes standard. Infraforge is also the only provider here with pre-warmed domains, multi-IP provisioning, SSL and domain masking, and a published whitelabel program.

One benchmark to hold this post accountable to: Woodpecker scaled to 2,500+ mailboxes on Infraforge dedicated infrastructure, and ChannelCrawler reached an 85.71% positive reply rate on Salesforge plus Infraforge plus Warmforge. Both case studies are public. No shared-pool provider here can cite an equivalent reference at that scale.

Frequently Asked Questions

What is the main difference between Infraforge, Mailscale, and Maildoso?

It is the infrastructure model. Infraforge sells private infrastructure with dedicated IPs, so each account runs on its own isolated sending environment. Mailscale and Maildoso both run shared IP pools, where your reputation is influenced by other customers on the same pool. Infraforge starts at $40/mo for 10 mailboxes. Mailscale starts at $79/mo for 15 inboxes, and Maildoso starts at $75/mo for 30 SMTP mailboxes, both on shared pools.

Which is cheapest: Infraforge, Mailscale, or Maildoso?

At 50 mailboxes, Mailscale's $119/mo Business plan is the cheapest sticker price, followed by Maildoso's 70-mailbox SMTP plan at $158/mo. Infraforge at roughly $150/mo billed annually plus domains is the most expensive of the three. The gap reflects what you buy: Mailscale and Maildoso are shared-IP infrastructure, while Infraforge is dedicated-IP infrastructure. The real question is what reputation control your campaign needs, not which sticker price is lowest.

Does Infraforge offer a free trial?

No. Infraforge sells infrastructure, so trying it means provisioning at least one domain and the 10-mailbox minimum. You can sign up and explore the app without buying anything, but you cannot send until you provision. If you want a true trial period first, Mailscale offers a 7-day free trial and Maildoso runs a 30-day money-back guarantee on its quarterly plans.

Do I get a dedicated IP with Mailscale or Maildoso?

Not on the standard plans. Mailscale's Solopreneur, Business, and Enterprise tiers all use shared IP pools; dedicated IPs only appear on the $1,000+/month application-only Unlimited plan. Maildoso uses IP rotation across multiple shared IPs but does not allocate a dedicated IP per account. Infraforge gives you dedicated IPs on every account by default, with additional IPs available at $99/IP/month.

Which tool has better email deliverability?

Deliverability depends on sending discipline, but the infrastructure sets the ceiling. On shared pools like Mailscale and Maildoso, other customers can drag your placement down, and reviewers report inbox rates dropping below 50% in week two. Infraforge isolates each account on dedicated IPs, and the case studies on its site cite 97-100% inbox placement. Dedicated IPs reward clean sending and protect you from noisy neighbors.

Can I use Infraforge with Instantly, Smartlead, or other sequencers?

Yes. Infraforge works with any sending tool that accepts IMAP/SMTP credentials, including Instantly, Smartlead, Apollo, Lemlist, Reply, and Mailshake. The integration with Salesforge is native and skips IMAP setup, but you are not locked into any sequencer. The same applies to Mailscale and Maildoso, so you can pick your sending tool and your infrastructure separately.

Is Infraforge SOC 2 compliant?

Yes. The full Forge Stack, including Infraforge, carries SOC 2 compliance, documented on the Salesforge Trust Center. Neither Mailscale nor Maildoso advertises SOC 2 on its public site as of mid-2026. For agencies serving regulated industries like financial services, healthcare, or legal, SOC 2 is often a procurement requirement rather than a nice-to-have.

Who is Maildoso best for?

Maildoso fits senders who need to reach personal inboxes such as Gmail and Outlook.com and want real Google Workspace mailboxes mixed with cheaper SMTP under one bill. Its combo plans start at $90/mo for 15 Google Workspace and 15 SMTP mailboxes. It suits teams running fewer than 300 mailboxes that accept shared-IP risk. It does not offer an isolated enterprise plan, so agencies needing reputation isolation tend to outgrow it.

Which works best for agencies running multiple clients?

Infraforge. Multiple workspaces let you isolate each client's domains, mailboxes, and reputation, and each client can get dedicated IPs. Bulk DNS updates push changes across hundreds of domains in a few clicks. The Woodpecker case study scaled to 2,500+ mailboxes on Infraforge, a level that is hard to hold on shared pools. Mailscale and Maildoso do not publish equivalent multi-client agency case studies at that scale.