Head to head

Maildoso vs Puzzle Inbox

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

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

Puzzle Inbox

$0.35/inbox

Pre-warmed Google and Outlook inboxes for cold email. Outlook starts at $0.35 per inbox. Google starts at $3.

Where Puzzle Inbox fits

  • Teams that want cheap Outlook inboxes at volume
  • Senders who will spread volume across many inboxes
  • Buyers who want DNS already configured
  • Shops considering a done-for-you mailbox bundle

At a glance

DetailMaildosoPuzzle Inbox
Starting price$75/mo$0.35/inbox
Free tier–No–No
MCP server✓Yes–No
Public API✓Yes–No
Listed underDeliverabilityDeliverability

Where they pull apart

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

Puzzle Inbox

Stands out: Outlook 365 inboxes at $0.35 each with 100 inboxes per domain, sold beside Google at $3.

Watch out: Outlook allows only 3 emails per inbox per day. Google is 12 per day and 3 inboxes per domain. Delivery takes 24 to 72 hours.

Not the right fit for

  • Senders who need 20-plus emails per inbox per day
  • Teams that must have Google-only infrastructure

Pros and cons

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

Puzzle Inbox

  • Outlook inboxes from $0.35 each
  • Pre-warmed Google option at $3
  • DNS configured for you
  • Outlook capped at 3 emails/day
  • 24-72 hour delivery window
  • No published free trial

What each one costs

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

Puzzle Inbox

$0.35/inbox

Outlook 365 Standard is $0.35/inbox ($0.50 warmed), 100 inboxes per domain, 3 emails/inbox/day. Google Workspace Standard is $3/inbox ($4.50 warmed), 3 inboxes per domain, 12 emails/inbox/day. Delivery 24-72 hours. Done-for-you Starter/Growth/Scale bundles listed without printed bundle totals. Confirm current terms on the vendor site.

Checked 19 Sep 2026

Common questions

Is Maildoso cheaper than Puzzle Inbox?
Puzzle Inbox starts lower, at $0.35/inbox 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 Maildoso or Puzzle Inbox for free?
Neither carries a free tier on our listing.
Does Maildoso or Puzzle Inbox 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?