Comparison
WarmInboxes vs Primeforge, Mailforge & Infraforge
Primeforge, Mailforge and Infraforge are three products from one company. Primeforge sells Google Workspace and Microsoft 365 mailboxes, the like-for-like comparison with ours; Mailforge sells shared-IP cold email infrastructure and Infraforge private infrastructure on dedicated servers, neither of them Google or Microsoft mailboxes. They share this page because choosing between them is choosing a kind of infrastructure, and each row says which product it is about.
WarmInboxes column checked 2026-10-17 against /price.md, /how-it-works and /offer. Primeforge, Mailforge & Infraforge column: checked 2026-10-22 against its own pages at primeforge.ai.
| Criterion | WarmInboxes | Primeforge, Mailforge & Infraforge |
|---|---|---|
| Price | Prewarmed Google or Microsoft $6–$8 per inbox per month by billing cycle, free prewarmed .COM/.CO domain included. Azure tenants $50–$69 per month for up to 100 inboxes. Fresh inboxes on your own domains: Google $2.00–$3.50, Microsoft 365 $2.00–$3.00, Azure tenant $50. (source) | Primeforge: $4.50 per mailbox per month billed annually in its 25-mailbox example (about $94 a month; about $113 billed monthly), minimum 10 mailbox slots, .com domains $14 a year, and its FAQ says you can cancel. Mailforge: $3 per mailbox per month billed monthly (25 for $75), $60 a month for 25 billed annually, minimum 10 slots. Infraforge: $4 per mailbox per month billed quarterly (25 for $100 a month), $83 a month for 25 billed annually, minimum 10 slots, dedicated IPs $99 per IP per month. All three are calculator examples at 25 mailboxes, not a rate at every size. (source: primeforge.ai/pricing) (source: mailforge.ai/pricing) (source: infraforge.ai/pricing) |
| Provider type | Official, licensed Google Workspace, Microsoft 365 and Microsoft Entra (Azure) tenants. Isolated per customer: no shared tenants, you hold admin on every mailbox. (source) | Primeforge: Google Workspace and Microsoft 365 mailboxes on US-based IPs. Mailforge: its own distributed, shared-IP infrastructure. Infraforge: private infrastructure on dedicated servers, with dedicated IPs as an add-on. (source: primeforge.ai/pricing) (source: mailforge.ai/pricing) (source: infraforge.ai/pricing) |
| Setup time | Delivered within 48 to 72 hours of payment, prewarmed and fresh alike, DNS included. Prewarmed sends the day it lands; fresh after 14 to 21 days of warmup. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: How long from payment to mailboxes you can send from, and does that include DNS? |
| Domain ownership | Prewarmed orders include a prewarmed .COM or .CO domain registered by us; fresh orders run on domains you own or buy through us. The Terms of Service set out the domain term and what cancelling does to it. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: Who registers the domain, who owns it, and what happens to it if you cancel? |
| DNS setup | SPF, DKIM, DMARC and forwarding configured before handover and verified by hand against a delivered message, on every platform. (source) | Automated SPF, DKIM and DMARC on all three. Mailforge and Infraforge sell SSL and domain masking at $2 per domain per month. (source: primeforge.ai/pricing) (source: mailforge.ai/pricing) (source: infraforge.ai/pricing) |
| Warmup | Prewarmed inboxes arrive already warmed. Fresh inboxes are warmed by our technicians for 14 to 21 days. Warmup then keeps running at 30 emails per inbox per day underneath your campaigns for as long as you hold the inboxes. (source) | Primeforge sells prewarmed Google and Microsoft mailboxes, warmed before you get access; the page shows no price. Mailforge's and Infraforge's pricing pages show no prewarmed product. (source: primeforge.ai/pre-warmed-mailboxes) (source: mailforge.ai/pricing) (source: infraforge.ai/pricing) |
| API access | REST API at api.warminboxes.com/v1 with read, write and orders:place scopes, a one-file CLI, and a sandbox where test keys run the same routes without charging. Reference published verbatim on this site. (source) | API access is listed on Primeforge's and Infraforge's pricing pages. (source: primeforge.ai/pricing) (source: infraforge.ai/pricing) |
| MCP support | Two MCP servers: a keyless public one exposing every free deliverability check read-only, and an authenticated one on the account that previews and places orders, follows builds and exports into sequencers. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: Can an AI assistant act on the account through an MCP server, and is the free diagnostic layer reachable without a key? |
| Sequencer integration | Direct export into Instantly, Smartlead, PlusVibe and EmailBison from the portal or the API; any IMAP/SMTP or OAuth tool from the credentials you hold. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: Which sequencers can mailboxes be exported into directly, and what does the export need? |
| Support | 24/7 WhatsApp with operators who run cold email campaigns themselves, plus email. No ticket queue. (source) | Infraforge's pricing page lists support and sells expert consulting at two sessions for $500. (source: infraforge.ai/pricing) |
| Replacement policy | A 7-day placement replacement guarantee: follow the sending requirements, and an eligible newly delivered inbox that fails the placement standard (warm primary inbox placement) in its first seven days is replaced at no charge; if the replacement still struggles, engineers work the setup with you. Placement itself is not guaranteed, as the Terms say, because receiving providers control filtering. Replacements after the first week are not free. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: What happens when an inbox stops landing: replaced, on what terms, in what time? |
| Testing methodology | Published: a dated placement test log with senders and seed accounts, a SURBL blocklist study and a Google sender reputation study by top-level domain, each with sample sizes and what the method cannot see. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: Is placement testing published, with dates, senders, seed accounts and sample sizes? |
| Real observations | Our own agency sends more than a million cold emails a month on this infrastructure, and the studies above are drawn from that sending. (source) | Not published on Primeforge, Mailforge & Infraforge’s own pages when read on 2026-10-22. Ask them: Does the provider send cold email on this infrastructure themselves, at what volume, and is any of it published? |
Where Primeforge, Mailforge & Infraforge may be the better choice
- A dedicated IP of your own, with Infraforge at $99 per IP per month, if you want sending reputation you control rather than Google’s or Microsoft’s.
- Lower cost per mailbox on shared infrastructure, with Mailforge at $2.40 effective on annual billing in its 25-mailbox example, if Google or Microsoft mailboxes are not a requirement.
- Provider mailboxes, shared sending and dedicated sending from one vendor, if you want to run all three side by side.
Verify it yourself: read both pricing pages the same day, put the thirteen questions to their support, and run a ten-inbox thirty-day test on each. All comparisons →