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The cheapest cold email inboxes at every size, on monthly and prepaid billing, with the minimums, add-ons and caps that change the real price. Every figure is the vendor’s own, checked on the date in our sources.
By Ali Tahir Sajjad, Chief Operating Officer · Published November 11, 2026
Disclosure: PureMail sells Google Workspace and Microsoft 365 inboxes and appears in these tables. Where a competitor is cheaper, we say so. Prices come from each vendor’s pricing page and our directory reviews. See how we review.
Short answer
InboxKit at $3 an inbox, and Zapmail at 97 to 100 mailboxes. You set them up yourself. PureMail is $3.10–$3.30 with the setup done.
PureMail at $2.90 an inbox, the lowest monthly price for Google Workspace or Microsoft 365 inboxes we have found, set up for you.
InboxKit at $2.50 and Zapmail at about $2.49 an inbox, if you can commit 12 months and accept non-refundable prepayment.
Maildoso’s SMTP mailboxes, from $0.49 at volume. They send 15 a day from Maildoso’s own servers, so the cost per email is higher than it looks.
Price
What each provider charges a month for the same number of inboxes on its cheapest monthly option, minimums included. The cheapest Google or Microsoft price in each column is marked.
| Provider | 10 inboxes | 50 inboxes | 100 inboxes | 200 inboxes | 500 inboxes |
|---|---|---|---|---|---|
| PureMailGoogle Workspace and Microsoft 365 | $33$3.30 each | $155$3.10 each | $310$3.10 each | $580$2.90 each · cheapest | $1,450$2.90 each · cheapest |
| InboxKitGoogle Workspace, Microsoft 365, Azure | $30$3.00 each · cheapest | $150$3.00 each · cheapest | $300$3.00 each | $600$3.00 each | $1,500$3.00 each |
| ZapmailGoogle Workspace and Microsoft 365 | $39$3.90 each | $164$3.28 each | $299$2.99 each · cheapest | $599$3.00 each | $1,499$3.00 each |
| Premium InboxesGoogle Workspace and Microsoft 365 | $37.92$3.79 each | $189.58$3.79 each | $379.17$3.79 each | $758.33$3.79 each | $1,625$3.25 each |
| HypertideGoogle Workspace, Microsoft Entra · Google inboxes; plus a $500 opening credit | $33$3.30 each | $165$3.30 each | $330$3.30 each | $660$3.30 each | $1,650$3.30 each |
| Cheap InboxesGoogle Workspace and Microsoft 365 | $35$3.50 each | $175$3.50 each | $325$3.25 each | $650$3.25 each | $1,500$3.00 each |
| PrimeforgeGoogle Workspace and Microsoft 365 | $45$4.50 each | $225$4.50 each | $450$4.50 each | $880$4.40 each | $2,050$4.10 each |
| MaildosoSMTP · Same mailbox count; each sends 15 a day | $75$7.50 each | $150$3.00 each | $225$2.25 each | $225$1.13 each | $499$1.00 each |
| MailforgeSMTP · SMTP slots, not Google or Microsoft | $30$3.00 each | $150$3.00 each | $300$3.00 each | $580$2.90 each | $1,300$2.60 each |
| InfraforgeSMTP · Per month, billed quarterly | $40$4.00 each | $200$4.00 each | $400$4.00 each | $780$3.90 each | $1,800$3.60 each |
Monthly totals in US dollars, before domains and add-ons. “Cheapest” marks the lowest Google Workspace or Microsoft 365 price in each column; SMTP is shown for comparison. Premium Inboxes bills every 4 weeks, shown per calendar month. Mission Inbox and ScaledMail do not publish a simple per-mailbox price, so they are not ranked here; see the full provider guide.
At 10 inboxes
Cheapest Google or Microsoft: InboxKit at $30 a month.
At 100 inboxes
Cheapest Google or Microsoft: Zapmail at $299 a month. Cheapest of any kind: Maildoso (SMTP) at $225.
At 500 inboxes
Cheapest Google or Microsoft: PureMail at $1,450 a month. Cheapest of any kind: Maildoso (SMTP) at $499.
The number that matters
An inbox is only worth what it can send. Here is what 100 inboxes cost a month and what that works out to per 1,000 cold emails, at each mailbox’s daily cap over 22 sending days.
| Provider | 100 inboxes, monthly | Same, prepaid | Cold emails a day each | Per 1,000 emails |
|---|---|---|---|---|
| ZapmailGoogle / Microsoft | $299 | $249.1712 months up front | 30our advice | $4.53 |
| InboxKitGoogle / Microsoft | $300 | $25012 months up front | 30our advice | $4.55 |
| MailforgeSMTP | $300 | $25012 months up front | 30our advice | $4.55 |
| PureMailGoogle / Microsoft | $310 | Monthly only | 30our advice | $4.70 |
| Cheap InboxesGoogle / Microsoft | $325 | Monthly only | 30our advice | $4.92 |
| HypertideGoogle / Microsoft | $330 | Monthly only | 30our advice | $5.00 |
| InfraforgeSMTP | $400 | $33312 months up front | 30our advice | $6.06 |
| PrimeforgeGoogle / Microsoft | $450 | $37512 months up front | 30our advice | $6.82 |
| MaildosoSMTP | $225 | Monthly only | 15vendor’s cap | $6.82 |
| Premium InboxesGoogle / Microsoft | $379.17 | $291.6712 months up front | 15vendor’s cap | $11.49 |
Assumes 22 sending days a month and every inbox sending its full daily amount. “Our advice” is 30 cold emails a day for a warmed Google or Microsoft inbox; where a vendor publishes a lower cap we use theirs. Prepaid prices are the monthly equivalent of a year paid up front, usually non-refundable.
Google and Microsoft
Cheap Google Workspace and cheap Microsoft 365 inboxes for cold email come from resellers. Here is the price per user from Google and Microsoft next to what cold email resellers charge per inbox.
| Where you buy | Price per user or inbox, a month | Terms |
|---|---|---|
| Google, bought direct (Flexible Plan) | $8.40 | Business Starter, monthly, cancel any time |
| Google, bought direct (Annual Plan) | $7.00 | Business Starter, one-year commitment; new customers get 10% off for 12 months on up to 20 users |
| Microsoft 365 Business Basic | $7.00 | Paid yearly; $5.40 without Teams |
| Microsoft Exchange Online Plan 1 | $4.00 | Mailbox only, paid yearly |
| PureMail (reseller, set up for you) | $2.90–$3.30 | Google or Microsoft, monthly, DNS and sequencer connection included |
| InboxKit (reseller, self-serve) | $2.50–$3 | Google or Microsoft; $2.50 needs 12 months prepaid |
| Zapmail (reseller, self-serve) | $2.99–$3.90 | Plans of 10, 30 and 100; about $2.49 on yearly billing |
| Cheap Inboxes (reseller, self-serve) | $2.80–$3.50 | Volume tiers from 100, 250 and 1,000 mailboxes |
| Primeforge (reseller, self-serve) | $3.75–$4.50 | Slots, 10 minimum; $3.75 needs 12 months prepaid |
Google prices checked October 22, 2026, Microsoft prices checked October 8, 2026, from the vendors’ own pricing pages.
Google sells Workspace per user. Business Starter is $7.00 a user a month on the Annual Plan or $8.40 on the Flexible Plan, which you can cancel at any time. Business Standard is $14 and Business Plus $22 on the annual plan. A cold email inbox needs none of what the higher plans add, so Business Starter is the plan that matters, and the cheapest Google Workspace you can buy from Google is the annual plan at $7.00, with a 10% first-year discount for new customers on up to 20 users.
That annual commitment is the catch for cold email. Inboxes get rotated as domains wear out, and on the Annual Plan you can add licences but not remove them until renewal. Most cold email teams who buy direct use the Flexible Plan, which puts 100 Google inboxes at about $840 a month before you have set any of them up. Through PureMail the same 100 cost $310, monthly, with DNS and the sequencer connection done.
Microsoft’s cheapest mailbox is Exchange Online Plan 1 at $4.00 a user a month, then Business Basic at $7.00, or $5.40 without Teams, all on annual subscriptions. New Microsoft tenants are also throttled to 10% of their outbound allowance for the first 30 days. Cold email resellers sell Microsoft 365 inboxes on monthly billing at the same $2.50 to $4.50 as Google. The cheapest Microsoft option we have found is Hypertide’s Entra tenants, about $1 an inbox, with a cap of roughly 3,000 sends a month per domain and a $500 opening credit.
More on each: Google Workspace inboxes for cold email and Microsoft 365 reseller inboxes.
Buying guide
Search for the cheapest email provider and you will find business email hosts built for a company’s everyday mail. Zoho Mail, for example, starts at $1 a user a month on its yearly Mail Lite plan, but limits external email by account reputation and says the product is designed for one-to-one mail (checked October 6, 2026). That is fine for your team’s inboxes and a poor base for outbound. For cold email, buy Google Workspace or Microsoft 365 inboxes, because that is where most of your prospects’ mail lives and what their filters trust most.
Marketplaces sell aged Gmail, Outlook.com and “phone-verified” accounts in bulk for cents. They are the cheapest email accounts you can buy and the most expensive mistake: they break Google’s and Microsoft’s terms, they were created by someone else, and they get suspended, often after you have connected them to your sequencer. Cheap inboxes should be new accounts, on domains you own, from a provider that tells you whose servers they send from.
To size your order before you compare prices, use the cold email calculator: put in your daily target and it returns the inboxes, domains and monthly cost. For more than price, including setup, warmup and mailbox type, read our guide to the best cold email infrastructure providers.
PureMail sells Google Workspace and Microsoft 365 inboxes at one monthly price per inbox, the same for either, and our team does the setup: SPF, DKIM, DMARC and MX on every domain, each mailbox created and connected to your sequencer, in about four hours.
Basic
$3.30
an inbox a month · 10 inboxes
Business
$3.10
an inbox a month · 30–100 inboxes
Enterprise Custom
$2.90
an inbox a month · 101+ inboxes
Not the cheapest under 100 inboxes: InboxKit is 10 to 30 cents an inbox less, and Zapmail at 97 to 100, if you do the setup yourself.
FAQ
What buyers ask when price comes first.
01
On monthly billing for real Google Workspace or Microsoft 365 accounts, InboxKit at $3 is the cheapest under 100 inboxes (Zapmail too, at 97 to 100), and PureMail is the cheapest from 101 at $2.90 an inbox with the setup done for you. On a year prepaid, InboxKit at $2.50 and Zapmail at about $2.49 are lower still. SMTP mailboxes from Maildoso go below $1 at volume, but send fewer emails each.
02
Bought from Google, Business Starter costs $8.40 a user a month on the Flexible Plan or $7.00 on an annual commitment (checked October 22, 2026). Cold email resellers sell the same Google Workspace accounts for about $2.50 to $4.50 an inbox, and PureMail charges $2.90 to $3.30 on monthly billing with the setup included.
03
From Microsoft, Exchange Online Plan 1 is $4.00 a user a month and Business Basic $7.00 ($5.40 without Teams), all paid yearly (checked October 8, 2026). Resellers sell Microsoft 365 inboxes for cold email at $2.50 to $4.50 a month. Hypertide’s Entra tenants work out near $1 an inbox but cap sending at about 3,000 a month per domain.
04
Google’s own price is per user for a full Workspace plan: $7.00 to $8.40 for Business Starter. Cold email resellers price per inbox instead, usually $2.50 to $4.50 a month, and some include DNS and setup. PureMail’s Google Workspace reseller pricing is $3.30 for 10 inboxes, $3.10 from 30 and $2.90 from 101.
05
Not because of the price. A $2.90 Google Workspace inbox sends from the same Google servers as a $7 one. What hurts deliverability is how they are used: too many inboxes per domain, missing SPF, DKIM or DMARC, no warmup and too many emails a day. Very cheap shared SMTP is a different product and can share reputation with other senders.
06
New Google Workspace or Microsoft 365 accounts on domains you own are safe. Cheap aged Gmail, Outlook.com or “PVA” accounts sold in bulk are not: they break Google’s and Microsoft’s terms, carry someone else’s history and get suspended, often with your sequencer and data attached.
07
About $3 to $4.50 an inbox a month for Google or Microsoft on monthly billing, plus about $10 to $15 a year per domain. 100 inboxes on PureMail cost $310 a month. Compare the cost per cold email you can send, not just per inbox: a mailbox capped at 15 a day costs twice as much per email as one sending 30.
Still have a question? [email protected] · contact us
Each vendor’s own pricing page, checked on the date shown. Prices change often; if one 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.