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Every cold email infrastructure tool worth a look, side by side: what kind of mailbox you get, what it really costs each month, who does the setup and the catch in the small print. Prices are each vendor’s own, checked on the date shown.
By Ali Tahir Sajjad, Chief Operating Officer · Published November 11, 2026
Disclosure: PureMail sells Google Workspace and Microsoft 365 inboxes, so we are on this list. Every competitor fact comes from the vendor’s own pricing page and our directory reviews, with the date we last checked it. Nobody paid to be included. See how we review.
Short answer
If you only read one thing: pick cold email mailboxes by type first (Google, Microsoft or SMTP), then by who does the setup, then by price.
Best done for you
PureMail
Google Workspace and Microsoft 365 · $2.90–$3.30 an inbox
Done-for-you Google Workspace and Microsoft 365 inboxes on monthly billing.
Read the summaryCheapest on annual billing
InboxKit
Google Workspace, Microsoft 365, Azure · $2.50–$3 a mailbox
The cheapest official accounts on annual billing, with an API.
Read the summaryBest self-serve dashboard
Zapmail
Google Workspace and Microsoft 365 · $39 for 10 mailboxes
A self-serve dashboard at 30 to 100+ mailboxes on yearly billing.
Read the summaryBest with warmup included
Premium Inboxes
Google Workspace and Microsoft 365 · $3.50 per 4-week cycle
Hands-off accounts with replacements and warmup included.
Read the summaryCheapest Microsoft inboxes
Hypertide
Google Workspace, Microsoft Entra · $1–$3.30 an inbox
Cheap Microsoft inboxes in isolated tenants, at agency scale.
Read the summaryCheapest SMTP mailboxes
Maildoso
SMTP on Maildoso’s servers · $0.49–$2.50 a mailbox
The lowest price per mailbox, if SMTP and B2B lists suit you.
Read the summaryPrice
What each provider charges a month for the same number of inboxes, on its cheapest monthly option. Yearly prepayment lowers some of these; we show that in each summary, because paying 12 months up front is a different commitment.
| Provider | Mailbox | 10 inboxes | 50 inboxes | 100 inboxes | 200 inboxes |
|---|---|---|---|---|---|
| PureMail | Google Workspace and Microsoft 365 | $33$3.30 each | $155$3.10 each | $310$3.10 each | $580$2.90 each |
| InboxKit | Google Workspace, Microsoft 365, Azure | $30$3.00 each | $150$3.00 each | $300$3.00 each | $600$3.00 each |
| Zapmail | Google Workspace and Microsoft 365 | $39$3.90 each | $164$3.28 each | $299$2.99 each | $599$3.00 each |
| Premium Inboxes | Google Workspace and Microsoft 365 | $37.92$3.79 each | $189.58$3.79 each | $379.17$3.79 each | $758.33$3.79 each |
| HypertideGoogle inboxes; plus a $500 opening credit | Google Workspace, Microsoft Entra | $33$3.30 each | $165$3.30 each | $330$3.30 each | $660$3.30 each |
| Cheap Inboxes | Google Workspace and Microsoft 365 | $35$3.50 each | $175$3.50 each | $325$3.25 each | $650$3.25 each |
| Primeforge | Google Workspace and Microsoft 365 | $45$4.50 each | $225$4.50 each | $450$4.50 each | $880$4.40 each |
| MaildosoSame mailbox count; each sends 15 a day | SMTP on Maildoso’s servers | $75$7.50 each | $150$3.00 each | $225$2.25 each | $225$1.13 each |
| MailforgeSMTP slots, not Google or Microsoft | SMTP, shared IP pool | $30$3.00 each | $150$3.00 each | $300$3.00 each | $580$2.90 each |
| InfraforgePer month, billed quarterly | SMTP on dedicated IPs | $40$4.00 each | $200$4.00 each | $400$4.00 each | $780$3.90 each |
| Mission InboxPriced by plan and sends | SMTP on dedicated IPs | $50 for 15 mailboxes | — | — | — |
| ScaledMailPriced per package | Google Workspace, Outlook, SMTP | Package builder | — | — | — |
Monthly totals in US dollars before domains and add-ons. Where a provider has a minimum (10 slots, 30 mailboxes), the 10-inbox column shows what you would actually pay. Premium Inboxes bills every 4 weeks, shown here per calendar month. Sources are listed at the end of the page.
From 101 inboxes
PureMail is the lowest monthly price for Google Workspace or Microsoft 365 inboxes on this list, at $2.90 an inbox, with the setup done for you.
Under 100 inboxes
InboxKit, at $3 an inbox, is 10 to 30 cents an inbox cheaper than PureMail’s $3.10–$3.30, and Zapmail is at 97 to 100 mailboxes. With both you do the setup yourself.
SMTP is cheaper per mailbox
Maildoso and Mailforge undercut everyone per mailbox, but on their own servers and with lower daily caps. Compare the cost per email sent, not per mailbox.
Method
We list cold email infrastructure tools that sell the mailboxes cold email is sent from, not the sequencers that send it.
Every number on this page is on the vendor’s own pricing page or checkout. If a vendor does not publish a price, we say so instead of guessing.
We price the same inbox count on each vendor’s cheapest monthly option, including minimums you pay for whether or not you use them.
A Google or Microsoft account and an SMTP mailbox are different products. We label every provider so you compare the same thing.
Setup time, DNS, the sequencer connection, warmup and how you cancel. The cheapest inbox is not cheap if you lose a week setting it up.
Reviewed
01 · Done-for-you Google Workspace and Microsoft 365 inboxes on monthly billing
PureMail is a Google Workspace and Microsoft 365 reseller that sets up cold email infrastructure for you. You buy inboxes and add your domains; our team adds SPF, DKIM, DMARC and MX on every domain, creates each mailbox and connects it to your sending tool, usually within four hours. One price per inbox, the same for Google and Microsoft, billed monthly.
02 · The cheapest official accounts on annual billing, with an API
InboxKit sells Google and Microsoft mailboxes at one flat rate at any volume: $3 a month, $2.70 quarterly or $2.50 on annual billing, with admin access, an API and automated DNS. You pay from a prepaid wallet, and its calculator moves to a custom quote past 200 mailboxes.
03 · A self-serve dashboard at 30 to 100+ mailboxes on yearly billing
Zapmail sells Google and Microsoft mailboxes in plans of 10, 30 and 100 ($39, $99, $299 a month), with extra mailboxes at $3.50, $3.25 or $3.00. Domains, DNS and the OAuth export to Instantly or Smartlead happen in one dashboard. Yearly billing takes two months off.
05 · Cheap Microsoft inboxes in isolated tenants, at agency scale
Hypertide sells Google inboxes at $3.30 each and Microsoft Entra domains at $25 a month, each with 25 Outlook inboxes in its own tenant, which works out at about $1 an inbox. Orders are automated end to end and land in your sequencer. New accounts start with a $500 credit.
06 · A flat per-mailbox price from a single mailbox
Cheap Inboxes charges one monthly price per mailbox with volume tiers: $3.50 up to 99, $3.25 from 100, $3 from 250 and $2.80 from 1,000, for Google or Microsoft. Every domain gets its own workspace with admin access, and domains are sold from $2.50 a year.
07 · Teams already on Salesforge who want Google and Microsoft slots
Primeforge is the Salesforge company’s Google and Microsoft product. You buy mailbox slots at $4.50 a month, or $3.75 a month paid yearly, with a 10-slot minimum, then create the mailboxes yourself with automatic DNS. Warmup is a separate product.
08 · The lowest price per mailbox, if SMTP and B2B lists suit you
Maildoso sells SMTP mailboxes on its own servers with rotating IP pools: $75 for 30, $225 for 300, $499 for 1,000, and custom quantities from $0.49. It allows 15 cold emails a day per mailbox and says placement can drop for Gmail and Yahoo recipients.
09 · Cheap SMTP slots for small teams, on a shared IP pool
Mailforge sells SMTP mailbox slots on a shared IP pool at $3 a month, falling to $2 past 1,000, or $2.50 a month paid yearly. Setup takes minutes with automatic DNS and tracking domains. It does not sell Google or Microsoft inboxes; its sister brand Primeforge does.
10 · Dedicated IPs and a workspace per client, past 50 mailboxes
Infraforge is the dedicated-IP member of the Salesforge family. Slots cost $4 a month billed quarterly, or $3.33 billed yearly, never monthly. Extra dedicated IPs are $99 a month each, and SSL with domain masking is $2 a domain.
11 · Dedicated SMTP with pre-send checks, priced by sends
Mission Inbox sells dedicated SMTP infrastructure on two plans: Lite at $50 with 15 mailboxes and a hard stop at 5,000 sends, and Scale at $199 with 30 mailboxes and 10,000 sends, then $1 per 1,000. It checks campaigns before they send.
12 · A managed mix of Google, Outlook and SMTP for high-volume agencies
ScaledMail builds a package around your daily volume: Google Workspace priced per mailbox, Outlook and SMTP per domain with a fixed number of mailboxes each. Domains, DNS, provisioning and monitoring are included; reporting is a paid add-on.
Mailbox type
This choice matters more than the provider. Inbox providers trust mail that comes from Google’s and Microsoft’s own servers, and each one treats its own users’ mail best.
Same accounts you would buy from Google, usually at a lower price from a reseller.
Google Workspace inboxesOutlook inboxes land best with Outlook recipients. Entra and Azure tenants are a cheaper variant with tighter caps.
Microsoft 365 inboxesMail goes out from the provider’s servers, not Google’s or Microsoft’s, on shared or dedicated IPs.
SMTP providers in the directoryMost teams sending more than a few hundred cold emails a day run both. PureMail sells Google Workspace inboxes for cold email and Microsoft 365 inboxes at the same price, so you can split a list by the recipient’s provider without paying more for either side.
Buying guide
Search for a “bulk cold email service” or a “cold email sending service” and you get two kinds of company mixed together. Sending tools such as Instantly, Smartlead and lemlist write, schedule and track your sequences. Cold email infrastructure providers, the twelve above, supply the inboxes and domains the sequences go out from. You need one of each. Several sequencers sell inboxes too, usually at a higher price than a specialist.
Put two inboxes on each sending domain, five at most, and keep your main company domain out of cold email. Authenticate every domain with SPF, DKIM and DMARC; our guide to SPF, DKIM and DMARC for cold email walks through it. Warm new inboxes for two to three weeks, then stay at 20 to 40 cold emails a day per inbox.
If you want that done for you, PureMail sets up the whole thing: DNS on every domain, each mailbox created and connected to your sequencer, in about four hours.
FAQ
What buyers ask before they pick a provider.
01
For most teams, Google Workspace or Microsoft 365 inboxes bought from a reseller that sets them up for cold email. Match the inbox to your prospects: Google for Gmail recipients, Microsoft for Outlook recipients. PureMail suits teams that want the setup done for them on monthly billing; InboxKit and Zapmail suit teams happy to self-serve and prepay.
02
Everything between your sequencer and the prospect’s inbox: sending domains, the mailboxes on them (Google Workspace, Microsoft 365 or SMTP), the SPF, DKIM, DMARC and MX records that authenticate them, warmup, and the connection to your sending tool. Good infrastructure spreads volume across many mailboxes and domains so no single one sends too much.
03
For Google or Microsoft inboxes, expect about $3 to $4.50 an inbox a month on monthly billing, plus domains at $10 to $15 a year each. 50 inboxes on PureMail cost $155 a month. SMTP mailboxes cost less, from $0.49, but send fewer cold emails each, so compare the cost per email sent.
04
Google Workspace and Microsoft 365 send from Google’s and Microsoft’s own servers, which inbox providers trust most, and each lands best with its own users. SMTP is cheaper per mailbox but sends from the vendor’s servers, often with lower daily caps. Many teams run Google and Microsoft side by side and split lists by the recipient’s provider.
05
The phrase covers two things. A cold email sending service, such as Instantly or Smartlead, writes and schedules your sequences. A cold email infrastructure provider, like the twelve on this page, supplies the inboxes and domains those sequences send from. You need both, and you connect the inboxes to the sending tool.
06
Divide your daily target by about 30 emails per warmed inbox. 1,000 cold emails a day needs about 34 inboxes, on about 17 domains at two inboxes each. Our cold email calculator does the maths for any volume, including domains and monthly cost.
Still have a question? [email protected] · contact us
Each vendor’s own pricing page, checked on the date shown in its summary. Prices change often; if you spot one that has moved, tell us at [email protected].
Google Workspace and Microsoft 365 inboxes from $2.90 a month, set up and connected to your sequencer today.