Infraforge

Name: Infraforge
Brand: Infraforge
Price: 4 USD

Private email infrastructure with dedicated IPs, provisioned in five minutes

Infraforge is the private infrastructure tier of the Salesforge stack: it provisions mailboxes on dedicated IP addresses rather than shared pools, registers domains at about $14 a year and mailbox slots from about $4 a month, automates SPF, DKIM, DMARC, and custom tracking domains in bulk, adds SSL and domain masking, warmup, and a unified Masterbox inbox, and exposes the whole thing through an API, a CLI, and an MCP server.

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Overview

Infraforge exists because its own sibling product has a structural weakness. Mailforge, the cheap tier of the Salesforge stack, runs on shared infrastructure, which means sending reputation is partly determined by other customers. Infraforge is the answer for buyers who will not accept that: dedicated IP addresses, private infrastructure, and a hard boundary between your sending reputation and everybody else's. Salesforge itself frames the choice that way, which is unusually candid vendor positioning.

That makes this a different purchase from the provider-account products in this category. These are not Google Workspace or Microsoft 365 accounts, so you do not get provider-to-provider treatment on delivery. What you get instead is control: your own addresses, your own reputation curve, and the ability to scale mailbox count without a per-account provider bill. It is the same architectural argument Maildoso makes at the budget end, with dedicated IPs replacing a shared pool.

Provisioning is fast, quoted at around five minutes to a working setup, and the bulk tooling is the strongest part of the product. DNS records are updated across many domains at once, domains can be transferred in, SSL and domain masking are available per domain, and workspaces separate clients or projects. Masterbox gives a single unified inbox across every account in a workspace, which is a real operational convenience when replies are scattered across dozens of mailboxes.

The automation surface is unusually complete for this category: a documented API, a CLI, and an MCP server, which means an agency can provision, monitor, and tear down infrastructure from a script or an assistant rather than a console. Sender rotation and intelligent sending limits are built in, and warmup is available in the stack through Warmforge rather than being an afterthought.

Pricing is component-based and needs modelling before it can be compared: domains at about $14 a year, mailbox slots from about $4 a month with a ten-slot minimum on annual billing, additional IP addresses at about $99 a month, SSL and domain masking at a few dollars per domain, and Masterbox at $7 to $9 a workspace. The dedicated IP line is the one that decides whether this is cheap or expensive, and it depends entirely on how many mailboxes you run behind each address.

Best for

Agencies and high-volume senders that want reputation isolated on dedicated IPs rather than shared pools, are comfortable sending from private infrastructure instead of provider accounts, and want to provision and manage the estate programmatically through an API, a CLI, or an AI assistant.

Not the right fit for

Buyers who need genuine Google Workspace or Microsoft 365 mailboxes, which is what Primeforge sells in the same stack and is a different product entirely.
Small senders. A ten-slot minimum plus a dedicated IP at about $99 a month makes this expensive per mailbox until the estate is large.
Teams that want somebody else to run the infrastructure, since this is a self-serve platform rather than a managed service.
Anyone expecting a sending platform. Infraforge supplies infrastructure and Salesforge or a third-party sequencer does the sending.
Operators who will not manage a dedicated IP responsibly, because isolation means every reputation mistake lands entirely on you.

How it works

1
You choose the infrastructure tier. Within the Salesforge stack, Mailforge is shared infrastructure, Primeforge is genuine Google and Microsoft mailboxes, and Infraforge is private infrastructure with dedicated IPs. They are alternatives rather than upgrades of one another.
2
You buy domains, at about $14 a year each, or transfer in domains you already own, and organize them into workspaces by client or project.
3
You provision mailbox slots, from about $4 a month each with a ten-slot minimum on annual billing. Slots are the unit you scale, and unlike provider accounts there is no third-party seat charge underneath them.
4
DNS is configured automatically. SPF, DKIM, DMARC, and custom domain tracking are written per domain, with bulk updates across the whole pool rather than domain by domain.
5
You attach dedicated IPs. Additional addresses are purchased separately, and how many mailboxes sit behind each address is the decision that governs both cost and reputation isolation.
6
You warm and send. Automated warmup and monitoring run in the stack, sender rotation and sending limits are applied automatically, and the mailboxes connect to Salesforge, Mailforge, or any third-party sequencer over IMAP and SMTP.

Feature breakdown

22 features in 4 modules

Private infrastructure and dedicated IPs

The reason to choose this over its cheaper sibling.

Dedicated IP addresses: Sending runs on addresses allocated to you rather than a shared pool, so reputation is a function of your own behavior only. This is the single structural difference from Mailforge and the reason the product exists.
Multi-IP provisioning: Additional addresses can be purchased and mailboxes distributed across them, which lets an agency isolate clients or separate aggressive campaigns from careful ones.
Private sending infrastructure: Mailboxes are hosted on the vendor's own infrastructure rather than being provider accounts, which removes per-seat provider costs and also removes provider-to-provider delivery advantages.
Setup in around five minutes: Working infrastructure is provisioned in minutes rather than hours or days, which is at the fast end of this entire category.
Pre-warmed domains and mailboxes: Ready-to-use inventory is available for buyers who need to start sending immediately rather than waiting out an aging and warmup period.
Unlimited domains and mailboxes: There is no cap on how large an estate can grow; the constraints are slot cost, IP capacity, and your own ramp discipline.

Domains, DNS, and authentication

Bulk operations across a whole domain pool.

Automated SPF, DKIM, and DMARC: Written per domain at provisioning, along with custom domain tracking, so authentication is correct before the first send rather than debugged afterwards.
Bulk DNS updates: Records are changed across many domains simultaneously, which is what makes a large pool maintainable when a policy or tracking domain has to change everywhere at once.
Domain registration and transfer: Domains can be bought at about $14 a year inside the platform or transferred in, preserving age that an existing domain has already accumulated.
SSL and domain masking: Available per domain for a few dollars a year, which keeps tracked links on a secure, masked domain rather than exposing an unadorned redirect that filters treat with suspicion.
Custom tracking domains: Open and click tracking runs on a dedicated domain rather than your primary one, keeping the real business domain out of the URL patterns filters cluster on.

Operating an estate

Workspaces, a unified inbox, and automatic sending controls.

Workspaces: Clients or projects are separated into their own workspaces, which is the organizational unit an agency needs before an estate reaches a hundred mailboxes.
Masterbox unified inbox: A single inbox across every account in a workspace for $7 to $9 a month, which solves the practical problem of replies scattered across dozens of mailboxes nobody is watching.
Automated warmup: Warmup runs in the stack, with Warmforge available as the dedicated deliverability tool alongside it, so conditioning is not left entirely to the sequencer.
Sender rotation: Sending is distributed across the mailbox pool automatically rather than concentrated on whichever accounts a campaign happens to reach first.
Intelligent sending limits: Per-mailbox volume ceilings are applied by the platform, which is the guardrail that a dedicated IP makes essential rather than optional.
Monitoring across the estate: Infrastructure health is tracked centrally, and Warmforge in the same stack adds deliverability testing and placement monitoring.

Automation and the Forge stack

API, CLI, and MCP, plus five sibling products.

Infraforge API: Programmatic provisioning and management of domains, mailboxes, and IPs, included rather than gated to a top tier.
Command line interface: A CLI for scripted operations, which is unusual in this category and suits agencies that treat infrastructure as code rather than as a console task.
MCP server: An AI assistant can provision and manage infrastructure directly as tool calls, which only a handful of vendors in this category support at all.
Works with any sequencer: Salesforge and Mailforge are the native paths, but the mailboxes connect over IMAP and SMTP to Smartlead, Instantly, and anything else, so the stack is not a lock-in.
Sibling products in one stack: Salesforge for sending, Agent Frank for AI SDR work, Mailforge for shared infrastructure, Primeforge for provider mailboxes, and Warmforge for deliverability, all under one vendor relationship.

Use cases

4 documented

Agency that outgrew shared infrastructure

Placement on a shared-pool provider became unpredictable and there was no way to tell whether the cause was internal or another customer on the same addresses.

Dedicated IPs make reputation attributable, multi-IP provisioning separates clients, and the API lets each client's infrastructure be created and torn down as part of onboarding and offboarding.

High-volume sender with a large mailbox estate

Per-mailbox provider pricing at three to four dollars each had become the largest line in the outbound budget at several hundred accounts.

Private infrastructure removes the provider seat cost, slots run about $4 a month or less at volume, and the dedicated IP cost is amortized across the whole estate rather than charged per mailbox.

Operator drowning in scattered replies

Replies land across dozens of mailboxes and the team either misses them or spends its mornings clicking between accounts.

Masterbox consolidates every account in a workspace into one inbox for a few dollars a month, which is a small feature that changes daily operations more than most large ones.

Technical team automating outbound end to end

Infrastructure provisioning is the only manual step left in an otherwise scripted client onboarding pipeline.

The API, the CLI, and the MCP server let domains, mailboxes, DNS, and warmup be created from code or from an assistant, which very little else in this category supports.

Pricing

from About $4 per mailbox slot per month on annual billing, with a ten-slot minimum

Component-based: domains billed annually, mailbox slots billed monthly with a minimum, dedicated IP addresses billed monthly, and SSL, domain masking, and the Masterbox unified inbox as separate add-ons.

Plan	Price	Includes
Mailbox slots	About $4 per slot per month billed yearly, about $9 billed quarterly	Ten-slot minimum Private infrastructure rather than provider accounts Automated DNS, warmup, and sender rotation Infraforge API included The unit you scale. Quarterly billing costs roughly twice as much per slot as annual.
Domains	About $14 per .com domain per year	Registered inside the platform Existing domains can be transferred in SPF, DKIM, DMARC, and tracking configured automatically Bulk DNS updates across the pool
Dedicated IP addresses	About $99 per month, billed quarterly	Reputation isolated to your own sending Multiple addresses for separating clients or campaign types The line item that decides whether this product is cheap or expensive Cost per mailbox depends entirely on how many mailboxes sit behind each address.
Add-ons	$6 per domain per year for SSL and domain masking	About $2 per domain per month on quarterly billing Masterbox unified inbox at $7 to $9 per workspace per month Warmforge available in the stack for deliverability testing

Add-ons

SSL and domain masking (About $6 per domain per year): About $2 per domain per month on quarterly billing.
Masterbox unified inbox ($7 to $9 per workspace per month)
Additional IP addresses (About $99 per month each)

Billing notes

Annual billing roughly halves the per-slot price against quarterly, which is the largest discount in the pricing and also the longest commitment.
The dedicated IP charge is the variable that decides the economics: at fifty mailboxes behind one address it adds about $2 a mailbox, at two hundred it adds about fifty cents.
There is a ten-slot minimum, so the smallest sensible estate is already a meaningful monthly commitment once an IP is attached.
Domains, SSL, masking, and Masterbox are all separate line items, so the sticker price per slot understates the fully loaded cost.
Warmup comes through the stack rather than being bundled into the slot price, so account for Warmforge or your sequencer's warmup.
No free trial, though the app can be explored after signup before any purchase, which is a slightly better evaluation path than most of this category offers.

Value assessment: Infraforge is priced for scale and looks bad below it. Ten slots at $4 plus one dedicated IP at $99 is roughly $139 a month for ten mailboxes, which is far worse than InboxKit or Mailforge for a small estate. Run two hundred mailboxes behind that same address and the arithmetic inverts: about $800 in slots plus $99 in IP against $500 to $700 for provider accounts that still share nothing with you in the way of reputation control. The honest framing is that you are buying isolation and programmability, and both only pay for themselves when the estate is large enough for shared-pool reputation risk to be a real operating cost.

Strengths & limitations

Strengths

Dedicated IP addresses, so sending reputation is isolated from other customers rather than shared.
Provisioning in around five minutes, at the fast end of the entire category.
An API, a CLI, and an MCP server, which makes the infrastructure genuinely operable by code or by an AI assistant.
Bulk DNS updates across an entire domain pool, which is what keeps a fifty-domain estate maintainable.
SSL and domain masking available per domain, addressing a specific mechanical cause of tracked-link placement problems.
Masterbox unified inbox across every account in a workspace, for a few dollars a month.
Sender rotation and intelligent sending limits applied by the platform rather than left to the operator.
Sits in a complete stack alongside sending, warmup, lead search, and an AI SDR under one vendor relationship, while remaining usable with third-party sequencers.

Limitations

Not provider accounts, so there is no Google or Microsoft provenance behind the mailboxes and no provider-to-provider delivery advantage.
The dedicated IP at about $99 a month makes small estates expensive per mailbox, and there is a ten-slot minimum on top.
Quarterly billing costs roughly twice as much per slot as annual, which pushes buyers toward a year of commitment in a volatile category.
Component pricing across slots, domains, IPs, SSL, masking, and Masterbox makes fully loaded cost harder to compare than a single per-mailbox number.
Self-serve only, with no managed option for buyers who want the estate run for them.
Dedicated IPs concentrate the consequences of a bad ramp entirely on you, with no shared pool to absorb mistakes.
The Forge stack now spans six products, and choosing correctly between Mailforge, Primeforge, and Infraforge takes more understanding than most first-time buyers arrive with.

Head-to-head comparisons

5 alternatives

Infraforge vs Mailforge

from $3 per mailbox slot per month billed yearly, ten-slot minimum, so about $30 per month

Siblings that are explicitly positioned against each other. Mailforge is shared infrastructure at about $2 a slot; Infraforge is private infrastructure with dedicated IPs at about $4 a slot plus roughly $99 an address. Mailforge is the right buy for cost-led estates and for senders whose complaint volume is high enough that a shared pool is a feature rather than a risk. Infraforge is for operators who want reputation attributable to their own sending and are running enough mailboxes to amortize an IP.

Full Infraforge vs Mailforge comparison

Infraforge vs Primeforge

from $4.50 per mailbox slot per month, ten-slot minimum, so about $45 per month

The other half of the same decision inside one stack. Primeforge sells genuine Google and Microsoft mailboxes at about $4.50 a slot with provider provenance; Infraforge sells private infrastructure with dedicated IPs at a similar slot price without it. If your prospects sit in enterprise Gmail and Outlook tenants, Primeforge. If you want isolation, unlimited scaling, and infrastructure you control, Infraforge.

Full Infraforge vs Primeforge comparison

Infraforge vs Mailreef

from About $249 per month plus about $0.001 per email sent

The closest competitor outside the Forge stack, since both sell dedicated infrastructure. Mailreef gives each customer a dedicated mail server plus a dedicated IP with around 150 inboxes for roughly $249 a month plus a per-send fee. Infraforge charges per slot plus about $99 an address, which is cheaper at small IP counts and more granular, while Mailreef offers deeper isolation at the server level and a simpler single price.

Full Infraforge vs Mailreef comparison

Infraforge vs Maildoso

from $75 per month for thirty mailboxes, about $2.50 each

Both run private infrastructure instead of provider accounts, at different points on the isolation curve. Maildoso is dramatically cheaper, from forty-nine cents a mailbox, but rotates across a shared IP pool and publishes lower per-mailbox sending guidance. Infraforge costs several times more and gives you your own addresses. If shared-pool reputation risk is the thing keeping you awake, that difference is the entire purchase.

Full Infraforge vs Maildoso comparison

Infraforge vs InboxKit

from About $2.50 per mailbox per month on annual billing

Two of the very few programmable products in this category, built on opposite architectures. InboxKit sells real Google, Microsoft, and Azure accounts from about $2.50 with an API and an MCP server; Infraforge sells private infrastructure with dedicated IPs, an API, a CLI, and an MCP server. Both suit automation-led agencies. Choose on architecture: provider provenance and lower entry cost at InboxKit, reputation isolation and unconstrained scaling at Infraforge.

Full Infraforge vs InboxKit comparison

Implementation & onboarding

Setup time: Around five minutes to a working setup, with pre-warmed domains and mailboxes available to skip the aging period. Full volume still waits on warmup and ramping, so plan two to three weeks for a new estate.
Learning curve: Moderate. The tooling is good but the decisions are real: which Forge product you actually need, how many mailboxes sit behind each dedicated IP, and how fast to ramp when there is no shared pool to absorb a mistake. The API and CLI reward technical teams and offer little to buyers who wanted somebody else to handle this.
Onboarding: Self-serve, with the app explorable after signup before any purchase. Documentation covers the API, the CLI, and the MCP server, and the surrounding stack is documented alongside it.
Migration notes: Domains can be transferred in rather than repurchased, preserving their age. Because mailboxes are private infrastructure rather than provider accounts, leaving means rebuilding them elsewhere and repointing DNS; the domains and the audience are what travel. Credentials are standard IMAP and SMTP, so the mailboxes work with third-party sequencers and changing sending platform never requires changing infrastructure.

Platform, API & security

Platforms: Web appREST APICommand line interfaceMCP serverPrivate mail infrastructure with dedicated IPs
API: A documented API for programmatic provisioning and management of domains, mailboxes, and IPs, plus a CLI and an MCP server so infrastructure can be driven from scripts or an AI assistant. Included rather than gated to a higher tier.
Compliance: SPF, DKIM, DMARC, and custom tracking domains configured automatically on every domainSSL and domain masking available per domain for tracked linksCAN-SPAM and GDPR sender obligations remain entirely the customer's, since Infraforge supplies infrastructure and never touches campaign content
Data residency: Not published as a selectable option. Confirm directly if regional hosting or EU IP allocation is a hard requirement.
SSO: Not advertised.
Security notes: Mailboxes run on the vendor's private infrastructure with dedicated IP addresses allocated per customer, which isolates sending reputation completely rather than rotating across a shared pool. Intelligent sending limits and sender rotation are applied by the platform, which matters more here than on shared infrastructure because there is no other customer's traffic to dilute a mistake.

Support & resources

Channels: Email supportIn-app supportDocumentation for the API, CLI, and MCP serverSupport shared across the Forge stack
Documentation: Documentation covering provisioning, DNS, dedicated IPs, and the automation surfaces, alongside a substantial published library on cold email infrastructure across the Salesforge properties.
Community: No dedicated forum. The Salesforge founder maintains a large public presence in the outbound community, which is where most of the practical discussion happens.

Company

Founded: 2022
Headquarters: Tallinn, Estonia
Ownership: Founder-led, largely bootstrapped with a small early round
Founders: Frank Sondors
Employees: Small team; exact headcount not disclosed
Funding: Salesforge, the parent, reported a pre-seed round of approximately $500K in 2024 and has otherwise grown on revenue. Infraforge is one of six products in the Forge stack rather than a standalone company.

Timeline

2022Salesforge is founded in Tallinn by Frank Sondors, with the first product going live the following year.
2024Mailforge launches as the shared infrastructure tier, and the limits of shared IP pools create the case for a private alternative.
2024Infraforge launches as the private infrastructure tier, provisioning mailboxes on dedicated IP addresses with automated DNS and bulk domain management.
2025Adds workspaces, the Masterbox unified inbox, SSL and domain masking, and multi-IP provisioning for separating clients across addresses.
2026Ships a CLI and an MCP server alongside the API, making the infrastructure fully operable from scripts and AI assistants.

Integrations

Salesforge
Mailforge
Warmforge
Smartlead
Instantly
GoHighLevel
Any IMAP and SMTP sending platform
REST API
CLI
MCP server

Frequently asked questions

10 questions

What is Infraforge and how does it differ from Mailforge and Primeforge?

All three are infrastructure products in the Salesforge stack, and they are alternatives rather than tiers. Mailforge is shared infrastructure at about $2 a slot. Primeforge sells genuine Google and Microsoft mailboxes at about $4.50 a slot. Infraforge is private infrastructure with dedicated IP addresses, which is what you buy when reputation isolation matters more than provider provenance or unit cost.

How much does Infraforge cost?

Mailbox slots are about $4 a month billed yearly with a ten-slot minimum, or about $9 billed quarterly. Domains are about $14 a year. Dedicated IP addresses are about $99 a month each. SSL and domain masking are about $6 per domain a year, and the Masterbox unified inbox is $7 to $9 per workspace a month. The IP charge is what decides the overall economics.

Are these real Google or Microsoft mailboxes?

No. Infraforge runs private infrastructure, which is why there is no per-seat provider cost and why mailbox count can scale without a third-party bill. The tradeoff is that you do not get the provider-to-provider delivery treatment that genuine Workspace and Microsoft 365 accounts receive. Primeforge in the same stack sells those if that provenance is what your recipient base requires.

What does a dedicated IP actually buy me?

Attribution. On shared infrastructure your placement is partly a function of other customers' sending and you can neither see nor control it. A dedicated address makes reputation entirely yours, which is valuable when you are large enough to be affected by pool behavior and dangerous when you are not disciplined, because every mistake now lands solely on you.

How many mailboxes should sit behind one IP?

There is no universal number, and it is the decision that governs both cost and risk. Amortizing an IP across two hundred mailboxes brings its cost to roughly fifty cents a mailbox but concentrates the whole estate's reputation on one address. Splitting across several addresses isolates clients or campaign types at a real cost. Model it deliberately rather than defaulting to one address for everything.

Does Infraforge have an API?

Yes, along with a CLI and an MCP server, all included rather than gated to a higher tier. That combination is rare in this category and it is the strongest reason for an automation-led agency to choose Infraforge: domains, mailboxes, DNS, and IPs can be provisioned and retired from a script or an assistant rather than a console.

What is Masterbox?

A unified inbox across every mailbox in a workspace, priced at $7 to $9 a workspace a month. It solves the ordinary operational problem of replies scattered across dozens of accounts, which is where most large estates lose real conversations. It is a small line item that changes daily work more than most of the headline features.

Does it include warmup?

Automated warmup runs in the stack, and Warmforge is the dedicated deliverability product alongside it for testing and placement monitoring. Warmup is not part of the slot price, so budget for it, and never treat a freshly provisioned mailbox on a dedicated IP as ready for volume, because a fresh IP has no reputation at all.

Can I use Infraforge with Smartlead or Instantly?

Yes. Salesforge and Mailforge are the native paths, but mailboxes connect over standard IMAP and SMTP to any sequencer, including Smartlead, Instantly, and GoHighLevel. Buying the infrastructure separately from the sending platform keeps both portable, which is the main structural argument for this category existing at all.

Is there a free trial?

No, though the app can be explored after signup before you buy domains or mailboxes, which is more than most vendors in this category offer. Real evaluation means buying a small estate on quarterly billing, running placement tests, and only then committing to annual pricing, which roughly halves the per-slot cost.

Editorial verdict

Infraforge is the private infrastructure option for operators who have concluded that shared IP pools are a risk they can no longer accept. Dedicated addresses, five-minute provisioning, bulk DNS across a whole domain pool, and an API, CLI, and MCP server make it one of the very few products in this category that a technical team can genuinely run as code. The economics are the whole decision. A dedicated IP at about $99 a month plus a ten-slot minimum makes small estates poor value, and the arithmetic only turns favorable somewhere north of a hundred mailboxes behind each address. Be equally clear about the architecture: these are not Google or Microsoft accounts, so if provider provenance is what your recipient base responds to, Primeforge in the same stack is the correct sibling to buy. Choose Infraforge when isolation and automation are the constraints, not when price is.

Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.