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

If you are choosing email infrastructure for cold outreach right now, the question is rarely "which is cheapest per inbox." The question is whether the deliverability holds up when you actually start sending. I have run cold campaigns through shared-pool providers and dedicated-IP providers, and the difference shows up between week two and week four - exactly when you have already committed budget and contacts to a campaign.

Mailscale and Maildoso are both popular at the cheap end of the market because they advertise low per-inbox cost and fast setup. But "per inbox" hides what you are actually buying. Mailscale runs your sending through its own SMTP servers on a shared IP pool. Maildoso does the same with SMTP mailboxes and offers a separate Google Workspace product on top. Infraforge gives you dedicated IPs, dedicated servers, and a per-mailbox price that does not jump between tiers when you add one more inbox than your current plan allows.

This post compares the three on infrastructure model, pricing at scale, deliverability control, and what happens when something goes wrong.

Quick-glance comparison

Mailscale: what it is and what it costs

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

The pitch on the homepage is straightforward: spin up 50 inboxes in less than a minute, plug them into Instantly or Smartlead or any IMAP/SMTP sequencer, and start sending. Mailscale handles the DNS configuration, owns the SMTP servers, and offers a 95-100% deliverability guarantee on professional inboxes (Google and Outlook recipients).

Core features

• Self-hosted SMTP servers - Mailscale owns its full infrastructure including SMTP servers and IP pools, rather than renting from Microsoft or Google
• Automated DNS setup - SPF, DKIM, and DMARC configured automatically when you add or buy a domain inside the platform
• Bulk inbox generation - Generate up to 200 inboxes in a single form submission and export as CSV
• Sequencer-agnostic - Plugs into Instantly, Smartlead, Apollo, Reply, Lemlist, Mailshake, or any IMAP/SMTP-compatible tool
• 95-100% deliverability guarantee - Mailscale will replace burned domains free of charge 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 the 200 cost $1.50 each.
• Unlimited: $1,000+/mo with dedicated IPs, a self-healing mechanism, and a dedicated deliverability specialist. Application-only.

Domains are sold inside Mailscale at around $10-$15/year per .com domain. You can bring your own domain for $2/domain extra, but Mailscale will not guarantee deliverability on bring-your-own domains.

Who Mailscale fits

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

Honest observations

The tier-break math is the most-flagged issue across review sites. If you need 16 inboxes you pay $119/mo, the same as someone running 50 inboxes. If you need 51 inboxes you pay $249/mo, the same as someone running 200. The penalty for crossing a tier is a $40-$130 monthly step.

Source: Trustpilot review of Mailscale, April 2026

The Trustpilot review thread is worth reading before committing to an annual plan. The most-upvoted negative review I found documents an attempt to cancel a $1,140/year Business plan trial that hit a broken cancellation page, a disabled Stripe billing portal, an unresponsive AI chat, and an auto-reply from the founder citing "health complications with no return date." That is one customer's experience, not a pattern, but it does describe a real cancellation flow that other reviewers echo. Mailscale operates a separate cancel page and most subscriptions are billed annually upfront, so the cancellation flow matters more than usual.

Deliverability across longer windows is the other issue. Mailscale recommends 20-30 emails per inbox per day, which is conservative and reasonable, but the shared IP pool means your reputation is partly determined by every other Mailscale customer on the same pool. Some users report inbox placement dropping below 50% in week two on G2 and Trustpilot threads. Mailscale's recovery guarantee covers this if you can document the drop, but you are still losing weeks of pipeline while domains get replaced.

Maildoso: what it is and what it costs

Maildoso is a cold email infrastructure provider that sells two products: SMTP mailboxes on its own infrastructure and real Google Workspace mailboxes on isolated workspaces (one domain per workspace). The Google Workspace product is the newer addition and is positioned for senders who target Gmail, Outlook.com, Yahoo, and other personal-email recipients where SMTP placement tends to be weaker.

The SMTP product is the budget anchor. At 300 mailboxes you are paying $1.90 per mailbox per month. The pitch on the homepage emphasizes 10M+ emails sent per day and 400K+ mailboxes managed, with 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 roughly 15 minutes
• Master inbox - Centralizes incoming replies across all mailboxes in one view
• Domain forwarding - Forward replies from all cold-email accounts to a destination of your choice
• 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 initial emails without burning deliverability, according to Maildoso's product page
• API access - Programmatic mailbox management

Pricing

Maildoso splits pricing across three tracks. Combo plans mix SMTP and Google Workspace mailboxes:

• 15 GW + 15 SMTP: $90/mo (6 domains required)
• 35 GW + 35 SMTP: $175/mo (14 domains required)
• 150 GW + 150 SMTP: $675/mo (60 domains required)

SMTP monthly plans:

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

Quarterly SMTP plans are cheaper per mailbox but require a 3-month commitment:

• 32 mailboxes: $299/quarter ($3.10/mailbox, 8 domains included)
• 68 mailboxes: $499/quarter ($2.40/mailbox, 17 domains included)
• 400 mailboxes: $2,199/quarter ($1.80/mailbox, 100 domains included)

Maildoso runs a 30-day money-back guarantee on quarterly plans. Domains on monthly plans are charged separately at around $12/year for .com.

Who Maildoso fits

Senders who specifically need to reach personal-email recipients (Gmail, Outlook.com) where SMTP infrastructure tends to land in spam, and who want the option to mix SMTP and Google Workspace under one bill. Maildoso's combo plans are the most cost-effective way to get real Google Workspace mailboxes paired with cheaper SMTP at scale.

Honest observations

Maildoso reviews are split. The G2 page averages 4.6 with 163 reviews and the positive reviews are real - users praise the 10-15 minute setup, the master inbox, and the API. The pros-and-cons summary on G2 surfaces "unreliable unified mailbox" as the top con with 18 mentions and "poor customer support" with 10 mentions, despite "exceptional customer support" appearing 29 times in positive reviews. Both can be true: support is fast at onboarding and slow at incident response.

The persistent complaint pattern across third-party review sites is burned domains on cheaper TLDs (.xyz, .click) and SURBL blocklisting events, with users reporting that they had to pause campaigns for days while deliverability recovered. The Maildoso team's stated position is that most "burned domain" complaints trace back to dirty email lists driving high bounce rates, not infrastructure failure - and that is often true. But the shared SMTP infrastructure does mean your sender reputation is influenced by other Maildoso customers' sending practices. As of early 2026, Maildoso does not offer an enterprise plan with isolated infrastructure, which is a meaningful gap for agencies and high-volume teams.

Infraforge: what it is and what it costs

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

Infraforge sits alongside Mailforge (shared IP infrastructure for cost-conscious teams), Primeforge (real Google Workspace and Microsoft 365 mailboxes), and Warmforge (deliverability monitoring and warm-up). For teams that want the dedicated-IP path, Infraforge is the default. The case study on the Infraforge homepage is Woodpecker, which scaled to 2,500+ mailboxes on Infraforge dedicated infrastructure.

Core features

• Dedicated IPs on every account - Each Infraforge account runs on isolated infrastructure. Your reputation is yours alone, not pooled with thousands of other senders
• Automated DNS setup - SPF, DKIM, DMARC, and custom domain tracking are configured automatically for every domain you add, following industry best practices
• Pre-warmed domains and mailboxes - Skip the 2-week warm-up window. Pre-warmed inventory lets you start sending on day one
• Multi-IP provisioning - Buy additional dedicated IPs at $99/IP/month to spread sending and protect reputation further
• SSL & domain masking - $2/domain/month. Display a branded website without exposing your primary domain to recipients
• Masterbox - $7/workspace/month. See every email across every mailbox in a workspace in one view
• Multiple workspaces - Keep each client or project isolated. Move domains and mailboxes between workspaces as needed
• Bulk DNS updates - Update DNS records across hundreds of domains in a few clicks, not one domain at a time
• Domain transferring - Add existing domains to Infraforge or transfer them out. Full registrar-level control
• Infraforge API - Programmatic control over the full infrastructure stack
• Whitelabel reseller program - 20% revenue share if you want to resell private email infrastructure under your own brand
• SOC 2 compliant - The full Forge Stack carries SOC 2 compliance, which matters for agencies serving regulated clients

The Forge Stack context

Infraforge is part of a connected stack. You can run Infraforge standalone with any sequencer (Salesforge, Instantly, Smartlead, Apollo, Lemlist, Reply, Mailshake - any IMAP/SMTP-compatible tool). Or you can pair Infraforge with the rest of the stack: Leadsforge for lead search, Warmforge for deliverability monitoring (free and unlimited when you also subscribe to Salesforge), Primeforge for mainstream Google/Microsoft mailboxes, and Salesforge or Agent Frank for the actual sending and AI personalization. The Forge Stack is sold as separate subscriptions but designed to integrate at the system level - no Zapier or middleware between the layers.

Pricing

Infraforge prices per mailbox, not per tier. There is no $40 penalty for adding one more inbox than the plan allows because there is no plan. You buy mailbox slots and pay for what you provision.

• Mailboxes: $4/mailbox/mo billed quarterly, $3/mailbox/mo billed annually (2 months free)
• Minimum: 10 mailbox slots
• Domains: .com domains at $14/year, charged once
• Additional dedicated IPs: $99/IP/month, billed quarterly
• SSL & domain masking: $2/domain/mo quarterly, $6/domain/year annually
• Masterbox: $7-9/workspace/month

For a typical 25-mailbox setup with 8 .com domains, the cost works out to $83/month billed annually or $100/month billed quarterly, plus $112/year for the domains. The pricing page has a calculator that takes your contacts-per-month and emails-per-sequence to size the infrastructure correctly.

Who Infraforge fits

Agencies running cold email for multiple clients, high-volume senders who care about reputation isolation, and operators who have outgrown shared-pool providers and need control over their own sending infrastructure. The Woodpecker case study scaling to 2,500+ mailboxes is the proof point - shared-pool infrastructure rarely holds up at that scale.

Honest observations

There is no free trial. Infraforge sells infrastructure - domains and mailboxes - so trialling means buying the minimum 10-mailbox slot and one domain. You can explore the app without provisioning, but you cannot send before you commit. If you need a free trial period before paying, Mailscale's 7-day free trial or Maildoso's 30-day money-back guarantee are easier entry points. Per-mailbox pricing also costs more than Mailscale at very small scale - 15 inboxes on Infraforge is $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.

Head-to-head: infrastructure, deliverability, pricing

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 sending reputation is influenced by every other customer using the same pool.

The shared model is fine when every customer follows best practices. The shared model breaks when one customer sends to a dirty list, gets flagged for spam, and drags the pool's reputation down with them. Mailscale's documentation says it monitors for blacklisting, spam reports, and bounces automatically. Maildoso's "self-healing mailboxes" feature pauses burned mailboxes for 14 days. Both are real mitigations. Neither removes the underlying risk that you do not control the reputation of the IPs you are sending from.

Infraforge solves this by giving you the IP. You can add more IPs at $99 each per month. You can mask domains with SSL. You can monitor your own reputation in real time. If you are running multiple clients in an agency, each gets its own workspace and the workspaces are isolated. Dedicated infrastructure costs more per mailbox at low volume, but at 50+ mailboxes the per-mailbox economics favor Infraforge and the reputation control is genuinely yours.

Setup time and DNS automation

All three providers automate SPF, DKIM, and DMARC setup. Times reported on official pages:

• Infraforge: First domain and mailbox live in 5 minutes
• Mailscale: 50+ inboxes generated in under 60 seconds (after you fill out the setup form)
• Maildoso: Mailboxes ready in approximately 15 minutes

Mailscale's 60-second claim is real but measures only the inbox creation step. You still need to add or buy domains inside Mailscale first, then submit the username form. Infraforge's 5-minute clock is the same workflow, including DNS configuration. In practice all three are fast enough that setup speed is not a meaningful differentiator. The differentiator is what happens after the inboxes are live, when warm-up and deliverability come into play.

Reputation control and pre-warming

Infraforge offers pre-warmed domains and mailboxes as a product. You can start sending on day one without the standard 2-week warm-up window. This is a real differentiator. Neither Mailscale nor Maildoso sells pre-warmed inventory at the product level - new mailboxes from both providers still need the standard warm-up period before high-volume sending.

For ongoing deliverability monitoring, Infraforge integrates with Warmforge, the Forge Stack's deliverability center. Warmforge tracks a per-mailbox Heat Score™ (target 97+), runs placement tests, and monitors blacklists in real time. Mailscale handles deliverability monitoring internally and offers the 95-100% guarantee on professional inboxes. Maildoso runs inbox placement tests every 3 days and displays a health score per mailbox.

Multi-IP, SSL, and advanced features

Infraforge is the only provider in this comparison that sells dedicated IP add-ons ($99/IP/month), SSL & domain masking ($2/domain/month), and a Masterbox feature for unified inbox visibility ($7-9/workspace/month). Mailscale's Unlimited plan includes dedicated IPs and a deliverability specialist but starts at $1,000+/month and is application-only. Maildoso has none of these.

For agencies that need to whitelabel infrastructure or display branded tracking domains, only Infraforge offers a published whitelabel reseller program with 20% revenue share.

Compliance and reseller programs

Infraforge and the broader Forge Stack carry SOC 2 compliance. Mailscale's site and Maildoso's site do not advertise SOC 2 compliance as of May 2026. For agencies serving regulated industries (financial services, healthcare, legal) this is often a hard requirement at procurement, not a nice-to-have.

Sequencer compatibility

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

Pricing compared at 50, 100, and 200 mailboxes

Sticker prices are misleading because each provider structures plans differently. Here is the cost-per-month at three common scale points, comparing the cheapest available plan from each:

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

1. 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 sender fingerprints. The two products are not equivalent. If you ask "how many dedicated-IP mailboxes does $249 get me on Mailscale," the answer is zero - dedicated IPs start at the application-only $1,000+/mo Unlimited plan.

2. Tier-break penalties. Mailscale's tier model means if you need 16 inboxes, you pay the 50-inbox price. If you need 51 inboxes, you pay the 200-inbox price. Maildoso jumps from a 70-mailbox plan to a 300-mailbox plan with nothing between them. Infraforge has no tier breaks - you pay for the slots you provision.

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

Who should use which

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 training course on the Business and Enterprise plans

You might consider Maildoso if:

• You specifically need to send cold email to 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 are running cold outreach as a primary revenue channel and need control over sender reputation
• You are an agency serving multiple clients and need isolated workspaces, dedicated IPs per client, and SOC 2 compliance
• You are scaling beyond 50 mailboxes where shared-pool reputation risk compounds and per-mailbox economics favor dedicated infrastructure
• You want to skip the 2-week warm-up window with pre-warmed domains and mailboxes
• You want infrastructure that integrates natively with the rest of the Forge Stack - Salesforge for sending, Warmforge for deliverability, Leadsforge for lead data - rather than stitching tools together with Zapier
• You want to resell email infrastructure under your own brand with the Infraforge whitelabel program (20% revenue share)

Final verdict

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

Infraforge in-app: dedicated IP add-ons at $99/month each. Real product, real pricing, real ownership.

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. Per-mailbox pricing scales without tier penalties. SOC 2 compliance comes standard. And Infraforge is the only provider in this comparison with pre-warmed domains, multi-IP provisioning, SSL & domain masking, and a published whitelabel reseller program.

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

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