Head to head

Puzzle Inbox vs Zapmail

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

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

Zapmail

$39/mo

Google Workspace and Microsoft 365 mailboxes for cold email. Starter is $39/mo for 10 Google mailboxes.

Where Zapmail fits

Freelancers starting with 10 Google inboxes
Agencies that want pre-warmed Workspace accounts
Teams exporting to Instantly or Smartlead
Senders who need one domain per workspace

At a glance

Detail	Puzzle Inbox	Zapmail
Starting price	$0.35/inbox	$39/mo
Free tier	–No	–No
MCP server	–No	–No
Public API	–No	✓Yes
Listed under	Deliverability	Deliverability

Where they pull apart

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

Zapmail

Stands out: Pre-warmed US/EU Google and Microsoft mailboxes with automated DNS and OAuth export to sequencers.

Watch out: API access starts on Pro at $299/mo. Extra Google mailboxes cost $3.50 each on Starter.

Not the right fit for

Buyers who need API access on Starter
Teams that want dedicated SMTP IPs they control

Pros and cons

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

Zapmail

Starter $39/mo for 10 mailboxes
Pre-warmed Google and Microsoft
OAuth export to major sequencers

API only on Pro at $299/mo
No published free trial
Extra Starter mailboxes are $3.50

What each one costs

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

Zapmail

$39/mo

Starter is $39/month for 10 Google mailboxes, extra mailboxes $3.50. Growth is $99/month for 30, extra $3.25. Pro is $299/month for 100, extra $3.00, and includes API access. All plans billed monthly. Pre-warmed Google and Microsoft accounts. No free trial. Confirm current terms on the vendor site.

Checked 19 Sep 2026

Common questions

Is Puzzle Inbox cheaper than Zapmail?

Puzzle Inbox starts lower, at $0.35/inbox against $39/mo for Zapmail. That is the entry plan on each side, so the real number depends on seats and the tier you land on.

Can you try Puzzle Inbox or Zapmail for free?

Neither carries a free tier on our listing.

Not the pair you wanted?

All Puzzle Inbox alternatives All Zapmail alternatives Every Deliverability tool

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