Head to head

MailDeck vs Maildoso

Same facts, side by side: starting price, free tier, MCP, API and what each one is actually built for.

MailDeck

$30/domain/mo

Cold email infrastructure with Outlook tenants, Google Workspace, and SMTP. Outlook Normal is $30/domain/mo for 100 inboxes.

Where MailDeck fits

  • Agencies buying Outlook inboxes by the hundred
  • High-volume senders mixing Outlook, Google, and SMTP
  • Teams that want setup and domain replacement included
  • Operators who need many mailboxes per domain

Maildoso

$75/mo

SMTP mailboxes for cold email, from $75/mo for 30 inboxes. API and MCP on every plan. 30-day money-back.

Where Maildoso fits

  • Agencies that want cheap SMTP at volume
  • Teams automating inbox setup through MCP
  • Senders who will buy or connect their own domains
  • Shops that need self-healing rotating IPs

At a glance

DetailMailDeckMaildoso
Starting price$30/domain/mo$75/mo
Free tier–No–No
MCP server–No✓Yes
Public API✓Yes✓Yes
Listed underDeliverability, OutreachDeliverability

Where they pull apart

MailDeck

Stands out: One US Microsoft tenant holds 100 Outlook inboxes, so 1,000 inboxes is 10 domains at the tenant rate.

Watch out: Sale rates sit under a higher regular rate. Google extra mailboxes cost $2.99 to $3.50 each. SMTP is a different stack.

Not the right fit for

  • Buyers who want one mailbox without a 100-inbox tenant
  • Teams that only need a sequencer, not inboxes

Maildoso

Stands out: MCP at mcp.maildoso.com plus REST so assistants can register domains and create mailboxes.

Watch out: Monthly plans skip domains ($12/year each). Cap is 1,000 mailboxes. A 30-day money-back window is not a trial.

Not the right fit for

  • Buyers who need Google or Microsoft inboxes in the $75 pack
  • Senders who want a free trial rather than money-back

Pros and cons

MailDeck

  • $30/domain/mo for 100 Outlook inboxes
  • Google, Outlook, and SMTP on one vendor
  • Google plans include API and webhooks
  • Outlook sold in 100-inbox tenants
  • Sale price sits under a higher regular rate
  • No published free trial

Maildoso

  • $75/mo for 30 SMTP mailboxes
  • MCP and REST API on every plan
  • 30-day money-back guarantee
  • Domains extra on monthly plans
  • 15 cold emails per mailbox per day
  • No free trial, only money-back

What each one costs

MailDeck

$30/domain/mo

Outlook Normal is $30/domain/mo for 100 inboxes (regular $45). Premium is $40 (regular $55). Mixed is $35. Google Workspace Starter is $39/mo for 10 slots, Growth $99/mo, Enterprise $299/mo. Private SMTP is $0.50/inbox. Diversified Starter is $99/mo. Extra Google mailboxes are $2.99-$3.50. Confirm current terms on the vendor site.

Checked 19 Sep 2026

Maildoso

$75/mo

Monthly SMTP packs: 30 mailboxes $75/month ($2.50 each), 300 mailboxes $225/month ($0.75), 1,000 mailboxes $499/month ($0.49). API and MCP included. Domains $12/year on monthly plans ($15 from 1 Oct 2026). 15 cold emails per mailbox per day. 30-day money-back is not a trial. Legacy quarterly packs still listed. Confirm current terms on the vendor site.

Checked 19 Sep 2026

Common questions

Is MailDeck cheaper than Maildoso?
MailDeck starts lower, at $30/domain/mo against $75/mo for Maildoso. That is the entry plan on each side, so the real number depends on seats and the tier you land on.
Can you try MailDeck or Maildoso for free?
Neither carries a free tier on our listing.
Does MailDeck or Maildoso have an MCP server?
Maildoso ships a first party MCP server, so an AI assistant can work the product directly.

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Editorial listings, never paid rankings. Prices checked 19 Sep 2026. Confirm current terms on the vendor site. Spot an error?