Compare/Head to head

Premium Inboxes vs Warm Inboxes

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

Starting price

Premium Inboxes

$3.50/inbox/mo

Done-for-you Google Workspace and Microsoft 365 inboxes for outbound sending, from $3.50 per inbox per month.

Where Premium Inboxes fits

Outbound recruiting teams that need real Workspace or M365 boxes
Agencies standing up client domains
Desks that want DNS and warmup handled
Buyers who need a public API on every plan

Cold email sending infrastructure: prewarmed Google, Microsoft 365 and Azure inboxes on free domains that can send the day you buy them, and cheaper fresh inboxes on your own domains for scaling. Fresh inboxes start at $3 a month and prewarmed ones at $8 a month each.

Where Warm Inboxes fits

Agency recruiters launching cold business development email fast
Teams whose sending domains got burned mid-campaign
Desks scaling outreach across many inboxes
Instantly and Smartlead users who want inboxes set up for them

At a glance

Detail	Premium Inboxes	Warm Inboxes
Starting price	$3.50/inbox/mo	$3/inbox/mo
Free tier	–No	–No
MCP server	–No	–No
Public API	–No	–No
Listed under	Deliverability	Deliverability

Where they pull apart

Premium Inboxes

Stands out: Official Workspace and M365 inboxes with free replacements and sub-six-hour setup.

Watch out: It supplies the inboxes only. You still need a sequencer to send, and there is no MCP.

Not the right fit for

Teams that only need a sequencer, not inboxes
Buyers who want MCP

Warm Inboxes

Stands out: Prewarmed inboxes skip the two to three week warmup, so a recruiting desk can start a business development campaign the same day or swap in fresh senders when a domain burns mid-campaign. The setup is already done: domains, SPF, DKIM, DMARC and forwarding are configured before you log in.

Watch out: Prewarmed inboxes sit on domains the vendor supplies, not your brand, and cost more than double a fresh inbox. Every result on the site comes from the vendor's own customer stories. It is infrastructure only, so you still need a sequencer such as Instantly or Smartlead.

Not the right fit for

Recruiters who only send from their main company mailbox
Teams that want inboxes on their own brand from day one at the lowest price
Buyers looking for a sequencer or lead database

Pros and cons

Premium Inboxes

Official Workspace and M365, not lookalike domains
Setup in under six hours
Public API on all plans

No MCP
You still need a sequencer to send

Warm Inboxes

Prewarmed inboxes send on day one
DNS and authentication set up for you
Same-day replacement inboxes when a domain burns

Prewarmed inboxes use vendor-supplied domains
Results quoted are the vendor's own
Needs a separate sending tool

What each one costs

Premium Inboxes

$3.50/inbox/mo

From $3.50/inbox/mo. Confirm current pricing on the vendor site.

Checked 7 Sep 2026

Warm Inboxes

$3/inbox/mo

Prices are per inbox per month. Prewarmed Google or Microsoft inboxes come in packs of 3 with a free prewarmed .com domain at $8 an inbox monthly, $7 on 2-month or $6 on quarterly billing; a prewarmed Azure tenant of 100 inboxes is $69 a month. Fresh inboxes on your own domains need a 14 to 21 day warmup: Google Workspace from $3.50 an inbox monthly (down to $2 yearly at 100+ inboxes) and Microsoft 365 from $3 monthly ($2 yearly). Creating an account needs no card. Confirm current terms on the vendor site.

Checked 19 Oct 2026

Common questions

Is Premium Inboxes cheaper than Warm Inboxes?

Warm Inboxes starts lower, at $3/inbox/mo against $3.50/inbox/mo for Premium 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 Premium Inboxes or Warm Inboxes for free?

Neither carries a free tier on our listing.

Not the pair you wanted?

All Premium Inboxes alternatives All Warm Inboxes alternatives Every Deliverability tool

Editorial listings, never paid rankings. Prices checked 7 Sep 2026. Confirm current terms on the vendor site. Spot an error?