Mailscale Alternative: Three Providers, Lower Cost

Mailscale provisions self-hosted SMTP inboxes on tiered plans ranging from $1.25 to $5.27 per inbox per month. MailDeck provides three infrastructure types starting at $0.30/inbox for Microsoft 365 Outlook, $2.99/inbox for Google Workspace, and $0.50/inbox for Private SMTP. The core difference: Mailscale operates on its own SMTP servers with managed IP pools, while MailDeck routes through official Microsoft and Google IP pools alongside dedicated SMTP infrastructure.

MailDeck manages 833K+ inboxes across Microsoft 365, Google Workspace, and SMTP for 1,631+ clients, with 7.5M+ emails sent per day and a 98% inbox placement rate. Based on Q2 2026 MailDeck platform data.

Mailscale pricing verified on mailscale.ai and cross-referenced with Prospeo, Salesforge directory, and G2 reviews as of May 2026.

Quick Comparison

Pricing Comparison

Mailscale Pricing

Mailscale uses tiered plans with fixed inbox caps per tier. Additional inboxes on the Enterprise plan cost $1.50 each.

All tiers include automated DNS configuration, a deliverability guarantee (95-100% to professional inboxes), warmup support, and domain replacement if inbox placement falls below 80%. Domains purchased through Mailscale cost $10-15/year. Bringing your own domains adds a $2/domain management fee with no deliverability guarantee on imported domains.

The tier structure creates pricing jumps between plans. At 15 inboxes you pay $79/month ($5.27/inbox). To add a 16th inbox, you jump to the Business plan at $119/month. At 51 inboxes, you jump from $119 to $249/month. Each tier boundary forces a full plan upgrade rather than incremental per-inbox scaling.

MailDeck Pricing

MailDeck covers three infrastructure types, each with per-unit pricing that scales without tier jumps.

Microsoft 365 Outlook (100 inboxes per tenant):

Google Workspace:

Private SMTP (dedicated IP per client):

Minimum orders: Outlook 2 tenants ($60/mo, 200 inboxes), SMTP 100 inboxes ($50/mo), Google 10 inboxes ($39/mo).

Setup time: Google Workspace instant, SMTP 24 hours, Outlook 2-3 business days. All include automated DNS configuration with SPF, DKIM, and DMARC verification before the first email sends.

Cost at Scale: Side-by-Side

50 Inboxes

At 50 inboxes, Mailscale Business costs $119/month. MailDeck Outlook Normal costs $30/month for a full tenant of 100 inboxes. Even buying double the capacity on MailDeck Outlook costs 75% less than Mailscale.

MailDeck Google Workspace at a comparable count runs $117/month, nearly identical to Mailscale. The difference: Google Workspace inboxes route through official Google IP pools, the highest-trust sending infrastructure globally.

200 Inboxes

At 200 inboxes, Mailscale Enterprise costs $249/month. MailDeck Outlook Normal costs $60/month. That is a 4.2x difference, saving $189/month or $2,268 annually.

The MailDeck Diversified Stack Starter plan provides 215 total inboxes across all three infrastructure types for $99/month. That gives you Outlook for bulk, SMTP for buffer, and Google for premium segments, all at 60% less than Mailscale Enterprise with only Mailscale's self-hosted SMTP.

500 Inboxes

At 500 inboxes, Mailscale costs $699/month (Enterprise base of $249 plus 300 additional inboxes at $1.50 each). MailDeck Outlook Normal costs $150/month. That gap is $549/month, or $6,588 per year.

MailDeck Private SMTP at the same scale costs $250/month. Even the most expensive comparable MailDeck infrastructure type (SMTP to SMTP) runs 64% cheaper than Mailscale at 500 inboxes.

For a detailed breakdown of infrastructure costs across 11 providers at every scale, see our cold email infrastructure cost analysis.

1,000 Inboxes

At 1,000 inboxes, Mailscale's Enterprise tier with overages costs $1,449/month. Their Unlimited plan starts at $1,000+/month. MailDeck's Growth Diversified Stack costs $399/month for 1,130 inboxes across all three infrastructure types. That is a 2.5-3.6x cost difference while adding Microsoft and Google IP diversity.

The annual savings between MailDeck Outlook Normal ($300/month) and Mailscale Enterprise with overages ($1,449/month) reach $13,788 per year at 1,000 inboxes. To understand how many inboxes your operation needs at each volume target, see our inbox calculator guide.

Infrastructure Comparison

Mailscale: Self-Hosted SMTP

Mailscale runs its own SMTP servers with managed IP pools. The platform handles DNS configuration automatically, monitors for blacklisting and reputation issues, and provides domain replacement if inbox placement drops below 80%.

This is a single-protocol approach. Every inbox, every domain, every email routes through the same self-hosted SMTP infrastructure. Mailscale recommends 20-30 cold emails per inbox per day with up to 5 email accounts per domain.

The advantage of this approach is speed and simplicity. Mailscale provisions inboxes in under 60 seconds. The 5-minute setup process generates a CSV of credentials ready for import into any sequencer. For teams that need inboxes immediately, that speed has real operational value.

MailDeck: Three Infrastructure Types

MailDeck provides Microsoft 365 Outlook, Google Workspace, and Private SMTP as three equal infrastructure pillars. Each type uses a different IP model.

Microsoft 365 and Google Workspace inboxes route through official provider IP pools. These IPs carry built-in trust because billions of legitimate emails flow through them daily. Corporate spam filters built for Exchange environments inherently trust emails arriving from Microsoft infrastructure. Google's sending infrastructure carries the highest trust score of any provider globally.

This matters most when your recipients sit behind enterprise mail servers. MailDeck platform data from 270M+ cold emails across 3,000+ domains shows that inbox type determines approximately 60% of deliverability outcomes. The remaining 40% comes from domain health and copy quality.

Infrastructure Diversification

Mailscale provides one infrastructure type. If that SMTP infrastructure encounters reputation issues or IP blocks, all inboxes are affected simultaneously.

MailDeck enables multi-provider diversification. The recommended approach splits volume across all three infrastructure types: Outlook as the primary workhorse for bulk outreach, Google Workspace reserved for enterprise C-suite segments, and SMTP as a volume buffer to protect premium inboxes from burn.

The Diversified Stack plans formalize this. The Growth plan includes 1,000 Outlook Premium inboxes + 100 SMTP inboxes + 30 Google inboxes for $399/month. Three distinct IP ecosystems under one provider.

If Microsoft tightens sending policies, Google and SMTP inboxes keep operating. If an SMTP IP hits reputation issues, Outlook and Google inboxes maintain deliverability through their official pools. For more on this approach, see our infrastructure diversification guide.

Where MailDeck Falls Short

Mailscale holds two legitimate advantages as an inbox provider.

Setup speed. Mailscale provisions inboxes in under 60 seconds. MailDeck's fastest option is Google Workspace (instant), but Outlook tenants take 2-3 business days and SMTP takes 24 hours. For teams that need hundreds of inboxes live within the hour, Mailscale delivers faster across its full product.

Lower entry point for small tests. Mailscale starts at $79/month for 15 inboxes. MailDeck's lowest entry is $39/month for 10 Google Workspace inboxes, which is cheaper in absolute terms. However, Mailscale's Solopreneur plan provides 15 inboxes on a single infrastructure type with no configuration choices needed. For operators running their first cold email test, that simplicity reduces the decisions required to get started.

Where MailDeck Wins

Lower cost per inbox at every scale above 50 inboxes. MailDeck Outlook Normal costs $0.30/inbox. At 200 inboxes, that is $60/month versus Mailscale's $249/month. At 500 inboxes, MailDeck Outlook Normal runs $150/month versus Mailscale's $699/month. At 1,000 inboxes, the annual savings exceed $13,000. Even comparing MailDeck's most expensive infrastructure type (Google Workspace at $2.99/inbox) to Mailscale's cheapest tier ($1.25/inbox at Enterprise), MailDeck Outlook and SMTP both undercut Mailscale at every scale.

Three infrastructure types under one provider. Mailscale provides self-hosted SMTP exclusively. MailDeck covers Microsoft 365 Outlook, Google Workspace, and Private SMTP. Teams can match their infrastructure to their target audience: Google for enterprise C-suite targeting where deliverability matters most, Outlook for high-volume SMB outreach, SMTP for volume buffer and copy testing before promoting to premium inboxes.

Official provider IP pools. MailDeck's Outlook and Google Workspace inboxes route through official Microsoft and Google IP pools. These IPs carry built-in institutional trust across every major receiving server globally. Mailscale's self-hosted SMTP uses its own IP pools where reputation depends on aggregate sending behavior across its client base. Official provider IPs carry trust that does not degrade under load.

Linear pricing without tier jumps. Mailscale forces plan upgrades at 15, 50, and 200 inbox thresholds. Need 16 inboxes? You pay for 50. Need 51? You pay for 200. MailDeck's per-tenant and per-inbox pricing scales linearly. Adding one more Outlook tenant adds exactly $30 or $40 depending on the licence. Adding 10 more SMTP inboxes adds exactly $5. No forced tier jumps.

More inboxes per domain. MailDeck Outlook tenants include 100 inboxes per domain. Mailscale provides up to 5 inboxes per domain. At 500 inboxes, Mailscale needs approximately 100 domains. MailDeck Outlook needs 5 domains across 5 tenants. Fewer domains means less DNS management overhead and fewer domains to monitor for burn signals.

Faster setup on Google Workspace. MailDeck Google Workspace provisions instantly, faster than Mailscale's 60-second setup for SMTP. MailDeck SMTP is ready in 24 hours. Outlook takes 2-3 days. All include automated SPF, DKIM, and DMARC verification before the first send. For authentication details across all three types, see our SPF, DKIM, DMARC configuration guide.

Scale economics that widen with volume. Mailscale's per-inbox cost improves with each tier jump, reaching $1.25/inbox at 200 inboxes on the Enterprise plan. Beyond 200, additional inboxes cost $1.50 each, which means the effective per-inbox cost rises as you scale past the tier cap. MailDeck's SMTP pricing drops from $0.50 to $0.40/inbox at 5,001+ inboxes, and the Diversified Stack provides combined volume pricing. The cost gap between providers widens at every milestone above 200 inboxes.

MailDeck Pricing Summary

Microsoft 365 Outlook (100 inboxes per tenant):

Google Workspace:

Private SMTP (dedicated IP per client):

Diversified Stack (Outlook Premium + SMTP + Google combined):

Minimum orders: Outlook 2 tenants ($60/mo), SMTP 100 inboxes ($50/mo), Google 10 inboxes ($39/mo). All plans include automated DNS configuration (SPF, DKIM, DMARC) with 98% inbox placement on properly configured domains.

FAQ

How much does Mailscale cost per inbox?

Mailscale uses tiered pricing: Solopreneur at $79/month for 15 inboxes ($5.27/inbox), Business at $119/month for 50 inboxes ($2.38/inbox), and Enterprise at $249/month for 200 inboxes ($1.25/inbox). Additional inboxes on the Enterprise plan cost $1.50 each. An Unlimited plan starts at $1,000+/month. Annual billing reduces rates by roughly 20%. Current pricing on mailscale.ai.

What infrastructure does Mailscale use?

Mailscale runs self-hosted SMTP servers with managed IP pools. The platform includes automated DNS configuration for SPF, DKIM, and DMARC, along with blacklist monitoring and domain replacement if inbox placement drops below 80%. MailDeck uses three infrastructure types: Microsoft 365 Outlook on official Microsoft IP pools, Google Workspace on official Google IP pools, and Private SMTP on dedicated IPs per client.

How does MailDeck compare to Mailscale on pricing?

MailDeck undercuts Mailscale at every scale above 15 inboxes on Outlook and SMTP products. At 200 inboxes, MailDeck Outlook Normal costs $60/month versus Mailscale Enterprise at $249/month. At 500 inboxes, MailDeck Outlook Normal costs $150/month versus Mailscale at $699/month. MailDeck Google Workspace ($2.99-3.90/inbox) runs higher than Mailscale Enterprise per inbox, but routes through official Google IP pools with the highest trust score globally.

Can I use Mailscale or MailDeck with Instantly or Smartlead?

Yes. Both providers are infrastructure-only and export SMTP/IMAP credentials for use with external sequencers. Mailscale supports Instantly, Smartlead, Apollo, Reply.io, Lemlist, and Mailshake. MailDeck supports Instantly, Smartlead, Saleshandy, Apollo, Lemlist, Woodpecker, Reply.io, Snov.io, QuickMail, GMass, and any SMTP-compatible tool. Your sequencer does not affect deliverability. It is a scheduler.

How fast is Mailscale setup compared to MailDeck?

Mailscale provisions inboxes in under 60 seconds with a 5-minute overall setup. MailDeck setup varies by infrastructure type: Google Workspace is instant, Private SMTP is ready in 24 hours, and Outlook tenants take 2-3 business days. Both providers automate DNS configuration including SPF, DKIM, and DMARC.

What is the cheapest way to get 500 cold email inboxes?

At 500 inboxes, MailDeck Outlook Normal costs $150/month ($0.30/inbox across 5 tenants). MailDeck Private SMTP costs $250/month ($0.50/inbox). Mailscale costs approximately $699/month ($249 Enterprise base plus 300 additional at $1.50 each). The annual cost difference between MailDeck Outlook Normal and Mailscale at 500 inboxes exceeds $6,500.

Does Mailscale offer Microsoft 365 or Google Workspace inboxes?

No. Mailscale runs exclusively on self-hosted SMTP infrastructure. MailDeck provides three infrastructure types under one provider: Microsoft 365 Outlook at $0.30-0.40/inbox with official Microsoft IP pools, Google Workspace at $2.99-3.90/inbox with official Google IP pools, and Private SMTP at $0.40-0.50/inbox with dedicated IPs per client.

Methodology

Mailscale pricing verified on mailscale.ai and cross-referenced with Prospeo, Salesforge directory, G2 reviews, and ColdEmailKit as of May 2026. MailDeck pricing from published rates at maildeck.co. MailDeck platform data based on Q2 2026 metrics: 833K+ managed inboxes, 1,631+ clients, 7.5M+ daily emails, 270M+ cold emails sent lifetime, 3,000+ domains under management, 98% inbox placement rate. Mailscale tier pricing calculated from published plan pages. Check mailscale.ai for current Mailscale rates.

Last updated: May 2026