Comparison
The Best Cold Email Infrastructure Providers, Compared
10 providers compared on mailbox type, price per mailbox, pre-warmed inboxes, setup time and terms, using each one's own published pricing.
- IcemailGoogle + Microsoft$75
- MaildosoSMTP$75
- InboxKitGoogle + Microsoft$90
- MailforgeSMTP$90
- JetmailGoogle + Microsoft$99
- ZapmailGoogle + Microsoft$99
- HypertideGoogle + Microsoft$99
- CheapinboxesGoogle + Microsoft$105
- Premium InboxesGoogle + Microsoft$105
- InstantlyGoogle$150
Standard mailboxes, monthly billing, domains excluded. Checked October 2026.
How we compared
Cold email infrastructure providers side by side
Every figure comes from the provider's public website or help center, checked October 2026. Prices change, so confirm before you buy. Jetmail is one of the providers listed.
- Mailbox type: Google Workspace, Microsoft 365, or the provider's own SMTP servers.
- Price: monthly cost of 30 and 100 standard mailboxes on monthly billing, domains excluded.
- Pre-warmed: whether ready-to-send mailboxes are sold, and at what published price.
- Terms: setup time, minimum order, refunds and API access.
| Provider | Mailbox type | 30 mailboxes/mo | 100 mailboxes/mo | Pre-warmed (30) | Setup |
|---|---|---|---|---|---|
| Jetmail (us) | Google + Microsoft | $99 | $299 | $180/mo | 5 minutes on average |
| Zapmail | Google + Microsoft | $99 | $299 | Offered, price not public | 5–10 minutes |
| InboxKit | Google + Microsoft | $90 | $300 | $180/mo | Under 1 minute (first domain live in ~5) |
| Icemail | Google + Microsoft | $75 | $250 | $180/mo | 10–30 minutes |
| Instantly | $150 | $500 | $300/mo | Minutes | |
| Cheapinboxes | Google + Microsoft | $105 | $325 | $105/mo | Around 48 hours per its fulfillment policy (homepage says same day) |
| Premium Inboxes | Google + Microsoft | $105 | $350 | No | Within 12 business hours of onboarding (faster with paid priority) |
| Hypertide | Google + Microsoft | $99 | $330 | No | Automated, 4–6 hours on average |
| Maildoso | SMTP | $75 | $225 | No | About 5 minutes per mailbox; new domains up to 15 minutes |
| Mailforge | SMTP | $90 | $300 | $90/mo | Automated DNS; ready in minutes |
| Provider | Minimum | Refunds | API |
|---|---|---|---|
| Jetmail | 10 mailboxes (Starter) | Report a problem within 7 days; refund where eligible | Pro plan |
| Zapmail | 10 mailboxes (Starter) | Final and non-refundable (two narrow exceptions) | Pro plan |
| InboxKit | None | Generally non-refundable; credit if an order is delayed 48h+ | Yes, with webhooks |
| Icemail | Not stated | Case by case; none once delivered | All tiers |
| Instantly | Paid Instantly plan required (from $47/mo) | Not stated | Yes |
| Cheapinboxes | None stated | Discretionary; none for Google suspensions or blacklisting | Public REST API and MCP server |
| Premium Inboxes | 1 inbox | All sales final, except never-activated licences within 7 days | API page listed; details not public |
| Hypertide | None for Google; Microsoft sold per domain | Not public; month-to-month, cancel anytime | Included on every plan |
| Maildoso | 30 mailboxes (smallest pack) | 30-day guarantee only if mailboxes stop sending 3+ days due to Maildoso | REST API and MCP server |
| Mailforge | 10 mailbox slots (billed even if unused) | No refund of prepaid fees | Salesforge public API, MCP and CLI |
Sources: zapmail.ai · help.zapmail.ai/en/articles/12355038-what-happen · help.zapmail.ai/en/articles/13358418-pre-warmed- · help.zapmail.ai/en/articles/9759194-refund-polic · inboxkit.com/pricing · inboxkit.com/learn/inboxkit-prewarmed-mailboxes · inboxkit.com/refund-policy · icemail.ai/pricing · icemail.ai · icemail.ai/refund-policy · instantly.ai/pricing.md · help.instantly.ai/articles/9969215-pre-warmed-ac · help.instantly.ai/en/articles/10273259-instantly · cheapinboxes.com · cheapinboxes.com/fulfillment · cheapinboxes.com/terms · cheapinboxes.com/developers · premiuminboxes.com · premiuminboxes.com/pricing-page · premiuminboxes.com/refund-policy · premiuminboxes.com/delivery-policy · hypertide.io · hypertide.io/terms-of-use · maildoso.ai · maildoso.ai/pricing · maildoso.ai/resources/terms-of-service · mailforge.ai · mailforge.ai/pricing · mailforge.ai/terms · mailforge.ai/blog/pre-warmed-email-accounts · primeforge.ai/pricing
Cost
What 30 mailboxes cost per month
Monthly billing, mailboxes only. Every provider bills domains separately.
Standard mailboxes · 30 per month
Zapmail prices shown are first-year prices; its help center says Google Workspace plans rise to $49/$149/$449 after 12 months. Icemail standard price is a limited-time promo ($3.50 list). Instantly accounts also need a paid Instantly sending plan (from $47/mo), not included above. Premium Inboxes bills every 4 weeks (13 times a year). Hypertide's site also lists other per-order Microsoft prices; we show its Google rate. Maildoso mailboxes are its own SMTP accounts, not Google Workspace or Microsoft 365. Mailforge mailboxes are shared-IP SMTP, not Google Workspace or Microsoft 365. Sister product Primeforge sells real Google/Microsoft mailboxes at $4.50/slot monthly.
| Icemail | $75 |
|---|---|
| Maildoso | $75 |
| InboxKit | $90 |
| Mailforge | $90 |
| Jetmail | $99 |
| Zapmail | $99 |
| Hypertide | $99 |
| Cheapinboxes | $105 |
| Premium Inboxes | $105 |
| Instantly | $150 |
Pre-warmed mailboxes · 30 per month
Zapmail, Premium Inboxes, Hypertide, Maildoso don't publish a pre-warmed price. Mailforge: SMTP, not Google or Microsoft. InboxKit pre-warmed shown at its cheapest tier (2–4 weeks warmed), excluding one-time domain transfer fees. Cheapinboxes says pre-warmed is included at the standard rate.
| Mailforge | $90 |
|---|---|
| Cheapinboxes | $105 |
| Jetmail | $180 |
| InboxKit | $180 |
| Icemail | $180 |
| Instantly | $300 |
Mailbox types
Google vs Microsoft vs SMTP mailboxes
The cheapest line in the chart isn't always like for like. What you're buying matters as much as the price.
| Google Workspace | Microsoft 365 | SMTP | |
|---|---|---|---|
| Mail servers | Google's | Microsoft's | The provider's own, shared or dedicated IPs |
| Sender reputation | Your domains, on Google's infrastructure | Your domains, on Microsoft's infrastructure | Your domains plus the provider's IP pool |
| Good fit | Most B2B outreach | Prospects on Outlook; mixing providers | High volume where cost per mailbox matters most |
| Providers here | Jetmail, Zapmail, InboxKit, Icemail, Instantly, Cheapinboxes, Premium Inboxes, Hypertide | Jetmail, Zapmail, InboxKit, Icemail, Cheapinboxes, Premium Inboxes, Hypertide | Maildoso, Mailforge |
Best for
Which provider fits which team
Plans with pre-warmed priced upfront
Jetmail
Google and Microsoft at one price, pre-warmed from $6/mailbox after month one, domains registered to you.
Bundled plans and many integrations
Zapmail
50+ (Instantly, Smartlead, Lemlist, …) integrations and its own pre-warmed program. Check the price after year one before you commit.
No minimum order
InboxKit
Pay per mailbox ($3.00/mo) with an API and webhooks; pre-warmed priced by warm age.
Lowest Google/Microsoft sticker price
Icemail
$2.50/mailbox on a limited-time promo, with API access on all tiers.
All-in-one with a sequencer
Instantly
Inboxes on the same bill as Instantly. Google only, needs a paid Instantly plan, and Instantly keeps domains bought through it.
Volume discounts
Cheapinboxes
Tiers down to $2.80/mailbox at 1,000+, with pre-warmed included at the standard rate.
Buying a single inbox
Premium Inboxes
One-inbox minimum, Google or Microsoft at the same rate, uploaded straight into Smartlead or Instantly.
Flat per-inbox Google pricing
Hypertide
$3.30/inbox with no minimum; Microsoft sold per domain; API on every plan.
SMTP on a budget
Maildoso
$499 a month for 1,000 SMTP mailboxes. Not Google or Microsoft, and a 14-day warmup comes first.
Salesforge users
Mailforge
Shared-IP SMTP at $3.00/slot with native Salesforge sync.
Mailforge's sister products cover the gaps: Primeforge sells Google Workspace and Microsoft 365 mailboxes by the slot (10-slot minimum), and Infraforge sells mailboxes on dedicated servers at $4 per slot billed quarterly, with dedicated IPs at $99 a month each (infraforge.ai/pricing).
Mailbox for Gmail
Google Workspace mailboxes: direct from Google or through a provider
Most outreach runs on Google Workspace mailboxes: they send from your own domain on Google's infrastructure and connect to any sequencer. A free @gmail.com address can't send from your domain. You can buy Workspace straight from Google, or use a cold email provider, sometimes called a Google Workspace reseller, that sets up the tenants, DNS and connections for you.
| Google Workspace direct | Jetmail | |
|---|---|---|
| Price per mailbox | $7.00 annual / $8.40 flexible | $2.99–$3.90 by plan |
| Daily sending limit | 2,000 messages per user (500 on trial) | Same Google limit; cold email uses ~30/day |
| SPF, DKIM, DMARC, MX | You publish them | Published for you |
| Many domains | One workspace per domain, by hand | Created in bulk |
| Pre-warmed option | No | From $6/mailbox after month one |
Sources: Google Workspace plan pricing · Gmail sending limits in Google Workspace. US list prices; they vary by region.
Want Workspace mailboxes without the setup?
Calculator
Price your volume across every provider
- Mailboxes
- 46
- Domains
- 16
- Jetmail / mo
- $151
30 sends per mailbox per day, 3 mailboxes per domain, 22 sending days. Monthly billing, mailboxes only (domains are extra with every provider). Competitor prices from their public sites, checked Oct 2026.
Monthly cost for 46 mailboxes
- Jetmail$151
- Zapmail$151
- InboxKit$138
- Icemail$115
- Instantly$230
- Cheapinboxes$161
- Premium Inboxes$161
- Hypertide$152
- Maildoso$150
- Mailforge$138
- Zapmail prices shown are first-year prices; its help center says Google Workspace plans rise to $49/$149/$449 after 12 months.
- InboxKit pre-warmed shown at its cheapest tier (2–4 weeks warmed), excluding one-time domain transfer fees.
- Icemail standard price is a limited-time promo ($3.50 list).
- Instantly accounts also need a paid Instantly sending plan (from $47/mo), not included above.
- Cheapinboxes says pre-warmed is included at the standard rate.
- Premium Inboxes bills every 4 weeks (13 times a year).
- Hypertide's site also lists other per-order Microsoft prices; we show its Google rate.
- Maildoso mailboxes are its own SMTP accounts, not Google Workspace or Microsoft 365.
- Mailforge mailboxes are shared-IP SMTP, not Google Workspace or Microsoft 365. Sister product Primeforge sells real Google/Microsoft mailboxes at $4.50/slot monthly.
Get this quote by email
We'll send the breakdown plus a domain and DNS plan for 30,000 emails a month.
Zapmail, InboxKit, Icemail, Instantly, Cheapinboxes, Premium Inboxes, Hypertide, Maildoso, Mailforge, Google Workspace, Gmail and Microsoft 365 are trademarks of their respective owners. Jetmail isn't affiliated with or endorsed by them.
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Where should we send it?
Or see pricing →Frequently asked questions
What is the best cold email infrastructure?
It depends on volume and mailbox type. For Google or Microsoft mailboxes, Icemail has the lowest published price for 30 mailboxes ($75/mo). InboxKit and Premium Inboxes suit small orders, Cheapinboxes discounts large ones, and Jetmail publishes pre-warmed prices upfront. Maildoso is the budget SMTP option.
Who are the main cold email infrastructure providers?
This comparison covers Jetmail, Zapmail, InboxKit, Icemail, Instantly, Cheapinboxes, Premium Inboxes, Hypertide, Maildoso, Mailforge. Most sell Google Workspace and Microsoft 365 mailboxes; Maildoso, Mailforge sell SMTP mailboxes on their own servers.
Should I use Google, Microsoft or SMTP mailboxes for cold email?
Google Workspace and Microsoft 365 mailboxes send from the same infrastructure your prospects' own mail runs on, which is why most teams use them, often a mix of both. SMTP mailboxes cost less at volume, but their reputation depends on the provider's IPs.
Can I buy Google Workspace mailboxes for Gmail outreach directly from Google?
Yes. Google lists Business Starter at $7.00 per user per month on an annual plan or $8.40 on a flexible plan (US list price). You then set up each domain's DNS, users and sequencer connection yourself, which is the work cold email providers and Workspace resellers automate.
How much does cold email infrastructure cost?
For 30 standard mailboxes billed monthly, published prices run from $75 to $150 a month across the providers here, before domains. Pre-warmed mailboxes usually cost more.
Are pre-warmed inboxes worth it?
If you need to send this week, yes: they skip the 2–4 week warmup new mailboxes need. If you can wait, standard mailboxes plus a warmup tool cost less per month.