Head to head

Cheap Inboxes vs Puzzle Inbox

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

Cheap Inboxes

$3.50/mailbox/mo

Google and Microsoft inboxes for cold email, from $3.50 per mailbox per month. REST API and MCP included.

Where Cheap Inboxes fits

Agencies automating inbox orders through MCP
Teams that want one domain per workspace
Senders exporting over OAuth to Instantly or Smartlead
Buyers starting under 100 mailboxes

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

Detail	Cheap Inboxes	Puzzle Inbox
Starting price	$3.50/mailbox/mo	$0.35/inbox
Free tier	–No	–No
MCP server	✓Yes	–No
Public API	✓Yes	–No
Listed under	Deliverability	Deliverability

Where they pull apart

Cheap Inboxes

Stands out: MCP at api.cheapinboxes.com/mcp plus a REST checkout so agents can provision domains and mailboxes.

Watch out: The $3.50 rate is the 1-99 mailbox tier. Volume drops to $2.80 at 1,000-plus. Domains start at $2.50 per year extra.

Not the right fit for

Senders who need dedicated SMTP IPs they control
Teams that want domains included in the $3.50 rate

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

Cheap Inboxes

$3.50/mailbox/mo under 100
MCP and REST API included
Google and Microsoft same price

Domains extra from $2.50/year
No published free trial
Not dedicated SMTP you control

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

Cheap Inboxes

$3.50/mailbox/mo

1-99 mailboxes $3.50/mailbox/month, 100-249 $3.25, 250-999 $3.00, 1,000+ $2.80. Same price for Google and Microsoft. Domains from $2.50/year. API and MCP included. No free trial stated. 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 Cheap Inboxes cheaper than Puzzle Inbox?

Puzzle Inbox starts lower, at $0.35/inbox against $3.50/mailbox/mo for Cheap Inboxes. That is the entry plan on each side, so the real number depends on seats and the tier you land on.

Can you try Cheap Inboxes or Puzzle Inbox for free?

Neither carries a free tier on our listing.

Does Cheap Inboxes or Puzzle Inbox have an MCP server?

Cheap Inboxes ships a first party MCP server, so an AI assistant can work the product directly.

Not the pair you wanted?

All Cheap Inboxes alternatives All Puzzle Inbox alternatives Every Deliverability tool

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