Mailscale Alternative: Lower Cost at Scale with Native Microsoft 365

We manage 650K+ inboxes across Microsoft 365, Google Workspace, and SMTP infrastructure for 1,500+ clients at MailDeck, maintaining 98% inbox placement. Based on Q1 2026 platform data.

Mailscale offers tiered pricing with a deliverability guarantee and instant setup. MailDeck offers dedicated Microsoft 365 tenants at a lower per-inbox cost with 48-hour provisioning. Both serve the cold email market, but they make different tradeoffs.

This comparison breaks down pricing at every scale, the infrastructure differences, and when each provider makes more sense for your operation.

Mailscale pricing verified on https://www.mailscale.ai/#pricing-nh as of March 2026.

Quick Comparison

Pricing at Every Scale

Mailscale pricing (from their website):

• Solopreneur: $79/mo for 15 inboxes
• Business: $119/mo for 50 inboxes
• Enterprise: $249/mo for 200 inboxes
• Additional mailboxes: $2.38 each

MailDeck pricing:

Google Workspace:

• Start Up: 10 inboxes at $39/month ($3.90/inbox)
• Growth: 30 inboxes at $99/month ($3.30/inbox)
• Enterprise: 100 inboxes at $299/month ($2.99/inbox)

Outlook Normal Licence Tenants:

• 100 inboxes per tenant: $30/tenant ($0.30/inbox)

Outlook Premium Licence Tenants:

• 100 inboxes per tenant: $40/tenant ($0.40/inbox)

SMTP:

• Private SMTP: $0.50/inbox

Minimum orders:

• Outlook: 2 tenants (200 inboxes) → $60/month
• SMTP: 50 inboxes → $50/month
• Google Workspace: 10 inboxes → $39/month

MailDeck prices shown for SMTP product. Google Workspace and Outlook tenant pricing also available — see full pricing below.

Important context: Mailscale has a lower entry point ($79/month for 15 inboxes) and instant setup. MailDeck minimums: SMTP 50 inboxes ($50/month), Outlook 200 inboxes ($60/month), Google Workspace 10 inboxes ($39/month) - all with 48-hour provisioning. The cost advantage shifts to MailDeck once you consistently need 100+ inboxes.

Infrastructure Differences

MailDeck: Dedicated Microsoft 365 Tenants

MailDeck provisions dedicated Microsoft 365 tenants, Google Workspace inboxes, Outlook tenants, and SMTP inboxes with automated DNS configuration (SPF, DKIM, DMARC). Your emails send through Microsoft's or Google's servers with their established sender reputation.

This matters most when your recipients are enterprise companies using Microsoft Exchange. Microsoft-to-Microsoft email receives higher trust from corporate spam filters. For DNS details, see our SPF, DKIM, DMARC setup guide.

Mailscale: Self-Hosted SMTP with IP Pools

Mailscale runs self-hosted SMTP servers with their own IP pools. They offer a deliverability guarantee (95-100%) and included cold email training.

This matters if you want instant setup, a deliverability guarantee, or the included educational content.

Where MailDeck Falls Short

To give you an honest comparison, here's where Mailscale has advantages:

Setup speed. Mailscale delivers inboxes in under 60 seconds. MailDeck takes 48 hours to provision Microsoft 365 tenants. If you need inboxes today, Mailscale wins.

Deliverability guarantee. Mailscale offers a 95-100% deliverability guarantee. MailDeck maintains 98% deliverability but doesn't offer contractual guarantees.

Where MailDeck Wins

Cost at scale. Once you pass 200 inboxes, MailDeck becomes significantly cheaper. At 500 SMTP inboxes, you're paying $250/month vs approximately $962/month with Mailscale.

Dedicated infrastructure. Each MailDeck domain gets its own Microsoft 365 tenant. Your domains are fully isolated from other customers.

Transparent scaling. MailDeck pricing is published and linear across all products. No tier jumping. For a comparison across all providers, see our pricing analysis of 11 cold email providers.

Enterprise deliverability. Microsoft 365 infrastructure has the highest trust with corporate mail servers. We maintain 98% inbox placement across 650K+ managed Outlook inboxes.

Simpler pricing model. Mailscale tiers force you into pricing buckets. Need 51 inboxes? You're paying for a tier that may not fit. MailDeck offers straightforward per-inbox and per-tenant pricing across all products. To calculate your needs, see our inbox calculator.

MailDeck Pricing

Google Workspace Inboxes:

Minimum: Start Up plan (10 inboxes, $39/month)

Outlook Normal Licence Tenants:

Each tenant includes 100 inboxes. Minimum: 2 tenants (200 inboxes, $60/month)

Outlook Premium Licence Tenants:

Each tenant includes 100 inboxes. Minimum: 2 tenants (200 inboxes, $80/month)

SMTP Inboxes:

Minimum: 50 inboxes ($50/month)

All plans include automated DNS configuration (SPF, DKIM, DMARC).

FAQ

How much does Mailscale cost?

Mailscale charges $79/month for 15 inboxes (Solopreneur), $119/month for 50 inboxes (Business), and $249/month for 200 inboxes (Enterprise). Additional mailboxes cost $2.38 each. Current pricing on https://www.mailscale.ai/#pricing-nh.

How does MailDeck compare to Mailscale on price?

MailDeck charges from $0.50/inbox (SMTP) to $3.90/inbox (Google Workspace), plus Outlook tenants from $30/tenant. At 500 SMTP inboxes, MailDeck costs $250/month vs approximately $962/month with Mailscale. The tradeoff: MailDeck requires 48-hour setup.

Does Mailscale offer a deliverability guarantee?

Yes. Mailscale offers 95-100% deliverability guarantee on their professional inboxes. MailDeck maintains 98% deliverability across all tenants using native Microsoft 365 infrastructure.

Can I use MailDeck with Instantly or Smartlead?

Yes. MailDeck is infrastructure only. It provides SMTP credentials that work with any sequencer: Instantly, Smartlead, Salesforge, Apollo, and any other SMTP-compatible tool.

What infrastructure does Mailscale use?

Mailscale uses self-hosted SMTP servers with their own IP pools. MailDeck uses native Microsoft 365 Outlook tenants with Microsoft's established sender reputation.

Which is better for small teams?

Mailscale has a lower entry point ($79/month for 15 inboxes) and instant setup. MailDeck minimums: SMTP 50 inboxes ($50/month), Outlook 200 inboxes ($60/month), Google Workspace 10 inboxes ($39/month). For teams testing cold email or running small campaigns, both have accessible entry points. MailDeck becomes more cost-effective once you consistently need 200+ inboxes.

How long does MailDeck setup take?

48 hours. MailDeck provisions dedicated Microsoft 365 tenants with full DNS configuration. Mailscale delivers inboxes in under 60 seconds.

Methodology

Data sources: MailDeck platform metrics from 650K+ managed inboxes across 1,500+ clients. Competitor pricing verified from public pricing pages as of March 2026. Inbox placement rate (98%) measured across MailDeck Microsoft 365 infrastructure over Q1 2026.

Limitations: Competitor pricing may change. Custom enterprise pricing not included.

Last updated: March 2026

Written by Sabo Nagy

Founder & CEO

Has built email infrastructure serving 650K+ inboxes across 1,500 clients. Specializes in email infrastructure strictly for high-volume cold outreach.

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