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

I run cold email for a living. Infrastructure is the line item that most quietly destroys agency margin, and choosing wrong here costs more than choosing wrong on any sequencer or copy tool. This comparison is about three providers I've personally evaluated: Mailscale, Maildoso, and Mailforge. All three sell cold email mailboxes at scale. They route deliverability risk very differently.

I've also lived through enough domain burns to know the difference between a vendor that warns you before reputation collapses and one that hands you a .xyz replacement when your .com gets flagged. That's the lens this post is written through.

Quick-glance comparison

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Mailscale overview

Mailscale is a cold email infrastructure provider that sells inboxes in fixed tiers. The pitch is fast inbox provisioning, automated DNS, and a deliverability guarantee. You sign up, pick a tier, buy or bring domains, generate inboxes in a CSV, and plug them into a sequencer like Instantly or Smartlead.

Core features

• Bulk inbox creation in under 60 seconds, exported as a CSV with login credentials
• Automated SPF, DKIM, and DMARC configuration on every domain
• Built-in warm-up included with all paid plans
• 95-100% deliverability guarantee with 30-day domain recovery on the Business and Enterprise plans
• Owns the underlying SMTP and IP infrastructure (not a reseller of Google Workspace or Microsoft 365)
• Cold email course bundled with the Business plan
• Integrates with Instantly, Smartlead, Apollo, Saleshandy, Reply.io, Lemlist, Mailshake

Mailscale pricing

Mailscale pricing on the live mailscale.ai homepage as of May 2026:

• Mailscale Solopreneur: $79/month monthly ($63/month annual) - up to 15 inboxes, ~2,000 prospects/month
• Mailscale Business: $119/month monthly ($95/month annual) - up to 50 inboxes, ~10,000 prospects/month, deliverability consultant included
• Mailscale Enterprise: $249/month monthly ($199/month annual) - up to 200 inboxes, ~30,000 prospects/month, extra inboxes at $1.50/each
• Mailscale Unlimited Mailboxes: $1,000+/month - dedicated IPs, self-healing mechanism, dedicated deliverability specialist (sales-led signup)

Domains run $10-15/year inside Mailscale or $2/domain to bring your own (Mailscale explicitly does not guarantee deliverability on BYO domains). 7-day free trial on all paid plans.

Who Mailscale is best for

Solo founders and small agencies whose inbox count fits cleanly inside one of the tier caps (15, 50, or 200). The bundled cold email course and "we'll replace burned domains" guarantee read as targeted at first-time cold emailers more than experienced operators.

Honest limitations

• Tier breakpoints create a "growth tax." Need 16 inboxes? You jump from $79 to $119. Need 51? You jump to $249. That's a real penalty for an extra mailbox.
• Trustpilot critiques cluster around deliverability after week 2. Mailscale holds a 4.2/5 Trustpilot score across 88 reviews, with multiple recent 1-star reports describing inbox placement collapsing under 50% by week two, IP-pool swaps that didn't resolve the issue, and slow support during DNS incidents. The Mark Hutchinson review above is representative.
• The deliverability guarantee has carve-outs. It applies only to professional Google and Microsoft inboxes, and recovery requires "at least 80% inbox placement" within 30 days. BYO domains are explicitly excluded.
• No granular per-mailbox health monitoring. Reviewers consistently flag the lack of inbox health status or alerts as a gap.

Maildoso overview

Maildoso is a cold email infrastructure provider selling SMTP mailboxes and Google Workspace accounts. It positions itself as the budget alternative to Google Workspace and is one of the few providers that lets you mix SMTP and real Google Workspace mailboxes in a single combo plan. The platform handles DNS, IP rotation, master inbox forwarding, and 3-day inbox placement tests.

Core features

• SMTP-only, Google Workspace-only, or combo plans that mix both
• Automated SPF, DKIM, and DMARC configuration
• IP rotation across 35 global data centers
• Self-healing mailboxes: burned mailboxes auto-pause for 14 days, then return to rotation
• Inbox placement tests every 3 days per mailbox with health scores
• Master inbox feature: all replies forwarded to one destination
• Send links in the first email without (in their claim) tanking deliverability
• Full API access for programmatic mailbox creation
• 30-day money-back guarantee on quarterly plans

Maildoso pricing

Pricing from the live maildoso.ai/pricing page as of May 2026. They sell three product lines:

Monthly Combo (SMTP + Google Workspace):

• 15 GW + 15 SMTP, 6 domains required: $90/month ($3/mailbox)
• 35 GW + 35 SMTP, 14 domains required: $175/month ($2.50/mailbox)
• 150 GW + 150 SMTP, 60 domains required: $675/month ($2/SMTP and $2.50/GW)

Monthly SMTP-only:

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

Quarterly SMTP (domains included free):

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

Domains on monthly plans cost $12/year each. No free trial, but quarterly plans have a 30-day money-back guarantee.

Who Maildoso is best for

Teams that specifically want a mix of SMTP and Google Workspace mailboxes in one place, and operators comfortable committing quarterly upfront. The infrastructure works for short-term experiments and for budget-constrained agencies whose campaigns don't burn domains aggressively.

Honest limitations

Maildoso has no Trustpilot reviews and G2 (where it holds a 4.6/5 from 163 reviews) blocks automated capture, so I'll paraphrase the documented complaints from G2 and Reddit threads:

• Burned-domain replacements arrive as .xyz or .click TLDs. This is the loudest complaint across review aggregators. When a Maildoso-provisioned .com domain gets flagged, replacement domains often come back on non-standard TLDs that hurt deliverability and credibility on cold outreach. The Mailforge blog covers this pattern in detail in their Maildoso pricing breakdown.
• Quarterly billing locks you in before you can test. The Starter SMTP tier is $299 sight unseen. You don't get to validate deliverability on your own list before committing.
• Shared infrastructure quality varies. Independent tests cited in the Puzzle Inbox review put Maildoso SMTP at 85-90% inbox placement vs 92-95% on Google Workspace, over a 3-month, 100-mailbox test. Reddit reports describe SURBL blocklisting incidents that paused entire campaigns.
• Support during outages drags. Multiple reviewers report slow response times when platform-wide bugs hit, and CRM/Smartlead integration glitches that needed manual resets.
• No Microsoft 365 option. If your ICP skews enterprise, you can't run a Microsoft-tenant mailbox alongside the Google one to hedge ESP risk.

Mailforge overview

Mailforge is the shared-IP cold email infrastructure layer in the Forge Stack. It provisions inboxes in 5 minutes, auto-configures DNS, and is purpose-built for high-volume cold outreach. It sits alongside Warmforge (premium warm-up and deliverability monitoring), Infraforge (private dedicated IPs), Primeforge (real Google Workspace and Microsoft 365 mailboxes), and Salesforge (the multi-channel outreach platform).

Core features

• Per-mailbox flat pricing: $3 down to $2 depending on volume, no tier cliffs
• Setup in 5 minutes including automated SPF, DKIM, and DMARC configuration
• Bulk DNS updates from inside the app for multi-domain infrastructure
• Multiple workspaces (separate workspaces for each client or project)
• Domain transferring in or out (you own the domains)
• SSL and domain masking available as add-ons
• Works with any sending software, not locked to Salesforge
• Compatible with all major sequencers: Instantly, Smartlead, Lemlist, Saleshandy, Apollo, plus the Forge Stack's own Salesforge
• SOC 2 compliant
• Mailbox slots: pay for a slot and swap mailboxes in or out without altering the subscription
• Whitelabel and reseller program with 20% revenue share

The Forge Stack context

Mailforge is one product, not an island. The same login gets you native integration with Warmforge for free unlimited warm-up, Infraforge if you want to upgrade specific domains to private dedicated IPs, Primeforge if you want real Google Workspace mailboxes for ESP matching, and Salesforge as the outreach layer if you don't already have a sequencer. The pitch is one stack, one workflow, one support team.

Mailforge pricing

• Per-mailbox rate: $3/mailbox/month, dropping to $2/mailbox at higher volumes
• 200 mailboxes: ~$484/month (~$2.42/mailbox) versus $1,680/month for Google Workspace or $1,200/month for Microsoft 365 direct
• Annual billing: equivalent to $13/month per mailbox when billed annually, with 2 months free
• Free Warmforge warm-up available alongside every Mailforge subscription
• Add-on: SSL and domain masking, 2x 1:1 expert sessions at $500 if you need consulting

Who Mailforge is best for

• B2B agencies and high-volume senders who need 50+ mailboxes and want predictable per-mailbox economics
• Teams already using or considering the broader Forge Stack (Salesforge, Warmforge, Infraforge, Primeforge)
• Operators who understand cold email infrastructure and want a clean infrastructure layer without paid-for course bundles or commitment locks
• Resellers and agencies wanting whitelabel infrastructure with margin baked in

Honest limitations

• Shared IP pool. Mailforge runs distributed shared IPs, not dedicated. If you need single-tenant IPs for higher-volume sending or ESP matching, you upgrade specific domains to Infraforge or Primeforge inside the same stack, but Mailforge alone isn't dedicated infrastructure.
• No native Google Workspace or Microsoft 365 mailboxes inside Mailforge. That's what Primeforge is for. If you specifically want real Google or Microsoft mailboxes (for ESP-matched sending), you pair Mailforge with Primeforge.
• No bundled deliverability guarantee. Warm-up and reputation monitoring come from Warmforge, included free with the Forge Stack but a separate workflow inside the app.
• Slightly more expensive per-mailbox at the lowest tier than Mailscale Solopreneur on absolute dollars (15 mailboxes at $3 = $45 vs $79 at Solopreneur). The math flips fast at scale.

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Head-to-head: feature by feature

Infrastructure model and IP strategy

All three run shared infrastructure at their entry tiers. Mailscale owns its SMTP and IP pools but routes all customers through them, so reputation hits from neighboring senders can ripple. Maildoso operates SMTP across 35 data centers with IP rotation as the headline differentiator. Mailforge runs a distributed shared IP pool engineered specifically for cold email volume patterns, and lets you upgrade individual domains to dedicated IPs via Infraforge inside the same dashboard without changing tools. Mailforge has the cleanest escape hatch when shared-IP risk becomes unacceptable.

DNS automation and setup time

All three automate SPF, DKIM, and DMARC. Mailscale and Mailforge both ship inboxes in 5 minutes. Maildoso advertises 15 minutes for 20 inboxes, slightly longer in practice. Mailforge is the only one of the three with bulk DNS updates from inside the app, which matters once you're running 50+ domains across multiple workspaces. Mailforge is also the only SOC 2-compliant provider of the three, which matters for B2B agencies serving enterprise clients.

Pricing model and scalability

This is where the three diverge most. Mailscale uses fixed-tier pricing with hard caps at 15, 50, and 200 inboxes - the "growth tax" of jumping from $79 to $119 for one extra inbox is a real margin hit at agency scale. Maildoso uses volume-tiered pricing with three breakpoints on each product line, and bundles domains free on quarterly plans. Mailforge uses pure per-mailbox flat pricing: $3 down to $2 with no tier cliffs. For an agency that runs 23 mailboxes this month and 87 next month, Mailforge is the only model that doesn't punish that variance.

Domain protection and burn recovery

This is the highest-stakes axis. Mailscale's deliverability guarantee promises 95-100% inbox placement and free domain replacement if a domain drops below 80% within 30 days, but the guarantee excludes BYO domains and Trustpilot reviewers report the recovery process drags. Maildoso's auto-heal pauses burned mailboxes for 14 days, and the documented pattern of .xyz or .click replacement domains is the loudest complaint across review aggregators. Mailforge uses mailbox slots: you keep additional mailboxes warming in the background as replacements, and Warmforge monitors reputation continuously so you see degradation before it becomes a burn. Different philosophies: Mailscale and Maildoso react to burns, Mailforge plus Warmforge tries to prevent them.

Free trial and risk

Mailscale offers a 7-day free trial on all paid plans. Maildoso has no free trial but offers a 30-day money-back guarantee on quarterly plans (so you commit $299+ upfront, then ask for it back). Mailforge runs monthly billing with no trial, but the per-mailbox economics mean you can test 10 mailboxes for $30 before scaling - effectively a smaller commitment than either alternative.

Ecosystem and integration

Mailscale and Maildoso both export to any major sequencer (Instantly, Smartlead, Lemlist, Saleshandy, Apollo, Reply.io). That's table stakes. Mailforge does the same, plus it slots natively into the Forge Stack: Salesforge for execution, Warmforge for warm-up and monitoring, Infraforge for dedicated IP upgrades, Primeforge for real Google Workspace mailboxes, and Leadsforge for the 500M+ contact database. If you'd rather not stitch tools together, Mailforge is the only one of the three that gives you that exit ramp.

Pricing comparison

Headline pricing tells one story. Total cost over 12 months at a real send volume tells a different one. Here's the comparison for a 50-mailbox setup and a 200-mailbox setup, with domains amortized monthly.

Read this table carefully. At 200 mailboxes, Mailscale Enterprise looks dramatically cheaper. That's because Mailscale's Enterprise tier is a flat plan with extra inboxes at $1.50 each beyond the base 200. The cost advantage holds only if you fit cleanly inside the tier and the deliverability guarantee actually holds for your sending pattern.

Mailforge's $484/month at 200 mailboxes (its publicly stated rate) is real per-mailbox cost without a tier cliff or recovery clause. If you're sending 300 mailboxes one month and 180 the next, Mailforge bills on actual usage and Mailscale bills on the higher tier.

Maildoso wins on sticker price for SMTP at 300+ mailboxes ($1.90/mailbox on the largest monthly plan) but loses on TCO once you factor in the domain replacement pattern and the lack of a free trial.

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Who should use which tool

You might consider Mailscale if:

• You want a 7-day free trial before you commit any money
• Your sending fits cleanly into one of three tiers (15, 50, or 200 inboxes) and you don't expect to grow past it
• You're new to cold email and the bundled course on the Business plan is useful to you

You might consider Maildoso if:

• You specifically want both SMTP and real Google Workspace mailboxes in one provider
• You can commit quarterly upfront and the 30-day money-back guarantee is enough safety
• Your campaigns are short-term experiments where a .xyz replacement domain wouldn't kill credibility

Choose Mailforge if:

• You're an agency or high-volume sender running 50+ mailboxes and need predictable per-mailbox economics without tier cliffs
• You want SOC 2 compliance baked in (the only one of the three that publishes a SOC 2 badge)
• You want a clean upgrade path to dedicated IPs (Infraforge) or real Google/Microsoft mailboxes (Primeforge) inside the same dashboard, without changing vendors
• You want free unlimited Warmforge warm-up alongside your infrastructure, not bundled "warm-up" of unknown pool quality
• You're a reseller or whitelabel partner and want 20% revenue share on every account you bring

Final verdict

Mailscale and Maildoso are both functional cold email infrastructure providers. Mailscale's tier model rewards you for staying inside a fixed inbox count. Maildoso's hybrid SMTP plus Google Workspace bundle is a genuine product differentiation. Neither is the wrong answer for every team. Both have documented complaints that I'd want a new operator to read before committing money.

For cold email infrastructure that scales without tier penalties, quarterly lock-ins, or .xyz replacement domains, Mailforge is the stronger choice. Per-mailbox flat pricing from $3 down to $2 at volume, SOC 2 compliance, 5-minute setup with bulk DNS updates, and a clean upgrade path to dedicated IPs via Infraforge or real Google Workspace mailboxes via Primeforge - all inside the same stack.

One falsifiable benchmark: LFG, a UK-based lead generation agency, used Mailforge and Warmforge to help their client Pepper go from zero to £397,161 in closed revenue in 6 months on cold email. SalesCaptain, a Clay Enterprise Partner, migrated 70% of their cold email infrastructure to Mailforge to scale outreach across 30+ clients. Both case studies are published with named customers and specific results.

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