Primeforge sells real Google Workspace and Microsoft 365 mailboxes for cold outreach, with DNS handled for you. It is the mailbox layer of the Salesforge stack, sitting between Infraforge (private infrastructure) and Salesforge (the sequencer).
The reason to shop around is straightforward: this is a category where the product is essentially identical everywhere. A Google Workspace mailbox is a Google Workspace mailbox. What actually differs between providers is price per seat, how fast provisioning is, whether DNS is automated, and how many other subscriptions you need to buy to make the mailboxes useful.
What to compare (the product is the same, so compare everything else)
- Price per mailbox per month. This is the whole ballgame at scale. At 60 mailboxes, a $2 difference is $1,440 a year.
- Provisioning time. Same-day versus a support ticket queue. This matters most the week you need to scale.
- DNS automation. Whether SPF, DKIM, DMARC and MX are published for you, and whether you can update them in bulk later.
- Ownership. Whether the Workspace accounts are yours and portable, or held under the provider’s tenant.
- What else you have to buy. Mailboxes alone do not send campaigns. Count the sequencer, the warmup tool and the data source.
1. Outboundry, $4/mailbox, and the rest of the stack included
We provision real Google Workspace and Microsoft 365 mailboxes at $4 per mailbox per month on monthly billing, the rate Primeforge reaches only on an annual commitment, against $4.50 on their monthly plan, with SPF, DKIM, DMARC and MX published automatically when the domain is added, and bulk DNS updates across every domain afterwards. Domains can be bought inside the app up to $14 per TLD, so you are not bouncing between a registrar, a DNS host and the mailbox provider.
The structural difference is that mailboxes are not a standalone purchase. The same subscription includes cold email sequencing, LinkedIn outreach, 500M+ lead records with verified emails and mobile numbers, unlimited warmup, the unified inbox, AI personalization, the AI Reply Agent and ICP scoring. If you later outgrow per-seat mailbox pricing, Mailboundry gives you dedicated-IP private infrastructure in the same account, so you can split campaigns between the two without changing platform.
Best for: teams who want mailboxes and a working outbound motion from one subscription.
Watch out for: if you already have a sequencer you love and genuinely only want mailboxes, you are buying more than you need.
2. Primeforge, the incumbent
Does what it says. Real Google and Microsoft mailboxes, automated DNS, pre-warmed inventory available, and tight integration with Salesforge if you are running the rest of that stack. Their documentation on Microsoft 365 sending limits and Gmail Promotions-tab behaviour is genuinely useful reading regardless of who you buy from.
Pricing is $4.50 per mailbox per month billed monthly, dropping to $4.00 on an annual commitment.
Best for: teams already running Salesforge for sequencing and Warmforge for warmup, where the ecosystem integration earns its keep.
Watch out for: the annual commitment required to reach the lower rate, and the fact that mailboxes are one of five subscriptions you will need. Compare the total.
3. Buying direct from Google or Microsoft, only for small setups
Nothing wrong with it if you need five mailboxes. You get full control, full ownership and support direct from the vendor.
It stops working at scale for two reasons. Price: you are paying full retail for a productivity suite when you only want SMTP and an inbox. And provisioning: creating and DNS-configuring 40 accounts by hand across 15 domains is a genuine day of work, repeated every time you expand.
Best for: under about ten mailboxes, or when procurement requires a direct vendor relationship.
Watch out for: the cost curve. It is linear and steep.
4. Other mailbox resellers (Zapmail, Maildoso, Mailscale, InboxKit, Hypertide)
A crowded category selling broadly the same thing. Differences show up in three places: whether you actually get real Workspace accounts or a lookalike SMTP mailbox, how fast provisioning is when you need 50 at once, and what happens to your accounts if you cancel.
If you evaluate one of these, ask two direct questions. Are these genuine Google Workspace or Microsoft 365 tenants, and can I take them with me? A surprising number of answers are less clear than you would expect.
Best for: teams who want mailboxes only, with no interest in the surrounding platform.
Watch out for: ownership terms and provisioning SLAs. Read both before committing to volume.
5. Private infrastructure, the answer once per-seat pricing breaks
Somewhere between 50 and 100 mailboxes, per-seat pricing stops being defensible. At that point you are paying seat prices for what is fundamentally an IP and a domain, and private infrastructure with dedicated IPs costs a fraction per send.
The trade is sender trust. A private SMTP mailbox does not carry Google’s inherent credibility, so it needs more careful warmup and better list hygiene. Most teams at scale run both: Google and Microsoft mailboxes for high-value target accounts, private infrastructure for volume.
Best for: anyone past roughly 50 mailboxes or 20,000 sends a month.
Watch out for: switching cold. Warm new infrastructure properly before moving volume onto it.
The cost maths, plainly
Both providers sell the same underlying product, so the only variables are the rate and whether you must commit for a year to get it.
| Mailboxes | Primeforge, monthly ($4.50) | Outboundry, monthly ($4.00) | You keep, per year |
|---|---|---|---|
| 10 | $45 / mo | $40 / mo | $60 |
| 25 | $112.50 / mo | $100 / mo | $150 |
| 50 | $225 / mo | $200 / mo | $300 |
| 100 | $450 / mo | $400 / mo | $600 |
Primeforge matches $4.00 if you commit annually. Outboundry is $4.00 without committing, which, for an agency whose mailbox count moves with its client roster, is worth more than the rate itself.
Then add the sequencer, the warmup tool and the lead data subscription to both columns, because that is the real comparison. On the Salesforge side those are three more products; on the Outboundry side they are already in the plan.
Competitor pricing taken from their public pricing pages at the time of writing. Prices change, verify current rates before you decide.
Next: the real cost of Google Workspace mailboxes for cold email, or private infrastructure alternatives compared.
Frequently asked questions
What is the cheapest way to get Google Workspace mailboxes for cold email?
Through a reseller rather than direct from Google. Direct seats cost several times more because you are paying for the full productivity suite. Outboundry provisions Google and Microsoft mailboxes at $4 per mailbox per month with DNS configured automatically.
How many mailboxes do I need for cold email?
Divide your target daily sends by a safe per-mailbox limit of 30 to 50, then add 30% headroom for warmup and rotation. For 500 sends a day that is roughly 12 to 17 mailboxes, and you should buy closer to 20.
Are Google mailboxes better than private SMTP for cold email?
For trust and reply handling, yes. Google and Microsoft mailboxes carry inherent sender credibility and thread properly. For cost at high volume, no. Per-seat pricing stops making sense somewhere past 50 to 100 mailboxes, where private infrastructure with dedicated IPs is far cheaper per send.
Can I use one domain for multiple cold email mailboxes?
You can, but keep it to around three mailboxes per domain. Concentrating more than that on one domain means a single reputation problem takes out all of them at once. Spread across more domains with fewer mailboxes each.
Do resold Google Workspace mailboxes deliver as well as direct ones?
Yes. They are real Google Workspace accounts on Google infrastructure. What varies between providers is provisioning speed, whether DNS is automated, whether you own the accounts, and what happens if you leave.