Icemail vs Mailforge vs Mailscale: Which Is Right For You?

Picking the right cold email infrastructure provider is one of the most consequential decisions you will make for your outreach program. Your deliverability, your sender reputation, and ultimately your reply rates all depend on the system running underneath your campaigns.

If you are evaluating your options and searching for a solid Mailforge alternative, a Mailscale alternative, or simply want an honest cold email infrastructure comparison before committing, this guide covers what each platform actually does, what it costs, and which one is the right fit for you.

This comparison focuses on three providers: Icemail, Mailforge (and its sibling product Primeforge), and Mailscale. Each one takes a meaningfully different approach to infrastructure type, pricing model, and the audience it serves. Understanding those differences is what will help you make the right call for your team size, budget, and outreach goals.

Types of Cold Email Infrastructure Providers

Before diving into the individual tools, it is worth understanding a foundational distinction that shapes everything else in this comparison: the difference between Google/Microsoft (native ESP) providers and SMTP-based (shared IP) providers. This split is critical because it directly determines your deliverability profile, your risk exposure, and how email providers perceive you as a sender.

Google and Microsoft native mailboxes are real Google Workspace or Microsoft 365 accounts, provisioned under official licensing agreements. When you send from these inboxes, you are sending from the same infrastructure that billions of people use every day for legitimate business communication. This gives you enormous credibility with spam filters. Because Gmail filters check sender behavior against known providers, sending from a genuine Google Workspace account signals authenticity in a way that custom or shared infrastructure simply cannot replicate. Icemail and Primeforge (within the Mailforge ecosystem) operate in this space.

SMTP-based infrastructure, on the other hand, involves shared IP pools maintained by the provider. Your emails are sent from servers that may be shared with thousands of other senders. Mailforge and Mailscale both rely on this model. The advantage is speed and lower cost. The risk is that other senders on the same IP pool can affect your deliverability. Research published in the Journal of Computer-Mediated Communication has shown that sender reputation is one of the most significant predictors of email deliverability, often outweighing content quality in algorithmic filtering decisions. This makes the infrastructure type you choose one of the highest-leverage decisions in your entire outreach stack.

With that framework in place, here is how Icemail, Mailforge, and Mailscale each position themselves within it.

Icemail: Native Google and Microsoft Infrastructure Built for Cold Outreach

Cold email infrastructure platform, Icemail.ai, provisions real Google Workspace and Microsoft 365 mailboxes, automating the entire setup process from DNS configuration to SPF, DKIM, and DMARC authentication. It is built specifically for outbound teams, agencies, and founders who want the deliverability advantages of native ESPs without the hours of manual setup that purchasing and configuring those accounts directly would require.

The platform operates on US-based IP addresses, which tend to receive more favorable treatment from American email providers and are better suited for reaching US-based business contacts. Icemail claims a 99.2% inbox delivery rate and has positioned itself as an official Google partner, which contributes to the reliability of the Google Workspace mailboxes it provisions. Setup time averages around 10 minutes, a dramatically faster experience than configuring Google Workspace or Microsoft 365 accounts manually through their native admin consoles.

Icemail Key Features

Icemail covers the full spectrum of infrastructure needs for cold outreach teams:

•        Automated DNS setup: SPF, DKIM, and DMARC records are configured automatically, eliminating manual DNS panel work and the 24-48 hour propagation delays that come with it.

•        Both Google and Microsoft support: You can provision Google Workspace mailboxes at $2.50 per month and Microsoft mailboxes at $3.00 per month, as well as basic IMAP/SMTP plans starting at $0.50 per month, giving you flexibility to match your infrastructure to your prospect base.

•        AI-powered domain finder: The platform uses AI to suggest clean domain names aligned with your brand, speeding up the domain acquisition process.

•        Bulk mailbox management: Agencies managing multiple clients benefit from separate workspace accounts, bulk email export to sending tools, and bulk update capabilities for modifying mailbox names and profile pictures at scale.

•        Pre-warmed mailboxes: Icemail's infrastructure includes pre-warming, which eliminates the startup delay before new inboxes can begin sending safely.

•        Integrations: One-click CSV export to Instantly, Smartlead, and other popular sending platforms keeps your sending workflow uninterrupted.

Icemail Pricing

Icemail uses a pay-as-you-go model with no locked subscription plans. Google Workspace mailboxes are priced at $2.50 per mailbox per month, Microsoft 365 mailboxes at $3.00 per mailbox per month, and basic IMAP/SMTP accounts starting at $0.50 per month. There is no minimum purchase requirement, and you only pay for what you use. This model is particularly cost-effective compared to purchasing Google Workspace or Microsoft 365 accounts directly, where the cost can exceed $6.00 per user per month even before DNS configuration labor is factored in.

Who Is Icemail Best For?

Icemail is the best fit for teams and agencies that want official Google Workspace and Microsoft 365 mailboxes with the speed and automation of a specialized cold email infrastructure platform. It suits both individual founders doing outbound at moderate volumes and agencies managing dozens of client campaigns simultaneously. Its flexible pricing model also makes it accessible to teams that are still building their outreach volume and do not want to commit to large tiered plans before they know exactly how many inboxes they need.

Mailforge and Primeforge: The Forge Stack Ecosystem

What Is Mailforge?

Mailforge is a cold email infrastructure tool that is part of the broader Salesforge ecosystem, which also includes Primeforge, Infraforge, Warmforge, and Leadsforge. Understanding Mailforge requires understanding which product within the Forge stack you are actually comparing, because Mailforge and Primeforge serve very different infrastructure needs despite being offered by the same company.

Mailforge itself is a shared IP infrastructure product. It provisions custom mailboxes within a distributed shared IP pool rather than through official Google Workspace or Microsoft 365 accounts. This makes it fast and affordable, but it also means your sending reputation is partially shared with other users on the same IP pool. Primeforge, on the other hand, is the Forge Stack's answer to native ESP infrastructure, provisioning official Google and Microsoft 365 mailboxes with automated DNS setup, similar in concept to what Icemail provides.

The distinction matters because many searches for a Mailforge alternative are actually searches for either a cheaper shared IP provider or a better native ESP option, and those require completely different comparisons. This article covers Mailforge as the shared infrastructure product and references Primeforge where relevant to the native ESP discussion.

Mailforge Key Features

Mailforge's core value proposition is fast, affordable inbox provisioning at scale:

•        Rapid setup: Hundreds of domains and mailboxes can be created in minutes, with SPF, DKIM, and DMARC configured automatically. Users report spinning up 10 inboxes in under 10 minutes.

•        Slot-based pricing: You purchase mailbox slots rather than individual inboxes, with a minimum of 10 slots. Domains are priced separately at $14 per year for .com domains, billed at $70 per year for a bundle of five.

•        Shared IP pool: Mailboxes are distributed across a shared infrastructure used by a large number of businesses, which can benefit newer senders who lack their own IP reputation, but introduces dependence on pool behavior.

•        Forge Stack integration: Mailforge integrates natively with Warmforge (for inbox warm-up, available separately or through a Salesforge subscription) and works alongside Primeforge and Infraforge for teams that want to diversify their ESP mix.

•        G2 rating of 4.7/5: Setup speed and responsive support are frequently cited by users as standout strengths.

Mailforge Pricing

Mailforge charges approximately $2 to $3 per mailbox slot per month, with discounts available at higher volumes (as low as $1.67 per month for bulk purchases). The minimum is 10 mailbox slots, making the floor around $30 per month before domain costs. Domains are $14 per year each. SSL and domain masking are optional add-ons at $2 per domain per month on monthly billing or $6 per domain per year on annual billing. Warmup is not included by default. Teams without a Salesforge subscription will need to budget separately for a warm-up tool such as Warmforge.

Primeforge, the native ESP sibling product, starts at approximately $3.50 to $4.50 per mailbox per month and includes automated DNS setup and domain provisioning at $14 per year. It is a meaningfully more expensive option than Mailforge but provides the deliverability advantages of official Google Workspace and Microsoft 365 accounts.

Mailforge Deliverability Risks to Know

The shared IP model that makes Mailforge affordable also introduces a known risk. Because your sending reputation is distributed across a pool of shared IPs, poor behavior from other senders on the same pool can affect your inbox placement. Some users have reported significant Gmail deliverability drops after using Mailforge at scale, particularly for campaigns targeting enterprise accounts where spam filtering tends to be more aggressive. For teams where consistent, predictable inbox placement is a requirement rather than a goal, this is worth weighing carefully against the lower price point.

Who Is Mailforge Best For?

Mailforge is the right tool for high-volume cold email teams that already have warmup and deliverability monitoring handled elsewhere and want the lowest possible per-inbox cost. It works well as a secondary infrastructure layer for agencies using a multi-ESP strategy, pairing Mailforge volume with Primeforge or Icemail native accounts to diversify risk. It is not the best choice for teams sending to enterprise targets or for anyone who does not have a separate warmup workflow already in place.

Mailscale: Tiered Inbox Automation with Built-in Warmup

What Is Mailscale?

Mailscale is a cold email infrastructure platform that automates the creation of email inboxes at scale, targeting B2B companies, agencies, and consultants who need to launch outbound campaigns quickly. It uses a tiered subscription model with plans designed around inbox count and monthly prospect limits, and it includes built-in warmup functionality, which is one of the features that differentiates it from Mailforge.

Mailscale operates on shared SMTP infrastructure and positions itself on speed: the platform claims you can generate up to 50 or more inboxes in under a minute, export a CSV, and plug them directly into Instantly or Smartlead. It is not a sending tool itself, so you will still need a separate outreach platform to run your sequences. Like Mailforge, Mailscale is a Mailscale alternative consideration for teams looking for shared infrastructure with a simpler, all-inclusive pricing approach.

Mailscale Key Features

•        Automated inbox creation: Large batches of email accounts can be generated across multiple domains rapidly, with SPF, DKIM, and DMARC configured automatically during setup.

•        Built-in warmup: Unlike Mailforge, Mailscale includes warmup functionality as part of the platform, removing the need for a separate warmup tool during the setup phase.

•        IMAP/SMTP compatibility: Inboxes connect with any major cold email sending platform through standard IMAP/SMTP credentials, keeping your workflow flexible.

•        7-day free trial: All plans include a trial period, allowing teams to test the platform before committing.

•        Domain health tracking: Mailscale includes tools for monitoring domain health and sender reputation as part of the plan.

•        Priority support on higher tiers: Enterprise plan users get direct access to the support team for technical issues and deliverability questions.

Mailscale Pricing

Mailscale uses a tiered monthly pricing structure with three main plans. The Solopreneur plan is $79 per month and covers up to 15 email accounts. The Business plan is $119 per month and covers up to 50 accounts. The Enterprise plan is $249 per month and covers up to 200 accounts, with additional accounts available at $1 per inbox per month beyond the plan limit. Annual billing discounts apply. Domains are sold within the platform at approximately $10 to $15 per year per domain, though some users have reported .com domain prices coming in closer to $15 despite lower starting prices shown before signup.

The tiered structure creates some awkward breakpoints. If you need 16 inboxes, you move from the $79 plan to the $119 plan for a single additional mailbox. The same jump happens at 51 inboxes, where the price moves to $249. For teams whose inbox count sits right at a tier boundary, this can make Mailscale meaningfully more expensive than a per-mailbox model like Icemail or Mailforge.

Who Is Mailscale Best For?

Mailscale is well-suited for teams scaling past 50 inboxes that want a zero-friction setup and want warm-up included in the same platform. Its flat-tier pricing becomes more economical at higher inbox counts, particularly at the Enterprise level, where the effective per-inbox cost drops significantly. Teams under 30 inboxes may find Icemail or Mailscale alternatives more cost-effective for their scale, while teams above 50 inboxes running consistent high-volume outbound will likely appreciate the predictability of Mailscale's flat-rate tiers.

For context on what inbox counts different outreach volumes actually require, Icemail's guide on how many mailboxes you actually need for cold email walks through the calculation in detail.

Icemail vs Mailforge vs Mailscale: Head-to-Head Comparison

Infrastructure Type

Icemail provisions real Google Workspace and Microsoft 365 mailboxes, meaning you are sending from the same infrastructure as legitimate businesses globally. Primeforge operates in the same category. Mailforge and Mailscale both use shared SMTP infrastructure, where your emails travel through IP pools shared with other senders. For deliverability to enterprise inboxes and Google/Microsoft accounts specifically, native ESP infrastructure has a measurable advantage. For high-volume sending to SMB contacts where you are managing cost carefully, shared infrastructure can perform adequately with the right warmup discipline. For more insight, you can go through the complete cold email infrastructure guide.

Pricing Model

Icemail charges per mailbox with no minimum commitment, making it the most flexible option for teams at any scale. At $2.50 for Google and $3.00 for Microsoft, it is competitive with native ESP alternatives and significantly cheaper than buying Google Workspace or Microsoft 365 directly. Mailforge charges per slot starting around $3 per mailbox with a 10-slot minimum, adding domain costs separately. Mailscale uses fixed tiers from $79 to $249 per month. The right model depends on your inbox count: Icemail and Mailforge are better for variable or smaller inbox needs, while Mailscale's flat tiers start making sense at 50 or more inboxes.

Warmup Inclusion

Icemail includes pre-warmed mailboxes as part of its infrastructure. Mailscale includes built-in warmup as part of all plans. Mailforge does not include warmup by default. Teams using Mailforge without a Salesforge subscription will need to purchase Warmforge separately or use a third-party warmup tool, which adds $30 to $50 per month to the effective cost and should be factored into any true cost-of-ownership comparison.

Setup Speed

All three platforms are designed for fast setup relative to manual configuration. Icemail averages around 10 minutes for a complete infrastructure setup. Mailforge users report spinning up hundreds of inboxes in minutes. Mailscale generates inboxes in under a minute for bulk orders. The critical difference is that with Icemail, those inboxes are real Google Workspace or Microsoft 365 accounts with full admin access, while Mailforge and Mailscale inboxes are custom-provisioned shared accounts.

Agency and Multi-Client Use

Icemail offers separate workspace accounts per client, making it easy for agencies to manage distinct infrastructure environments for each campaign or client relationship. Mailforge supports multi-workspace management through the Salesforge ecosystem. Mailscale does not offer dedicated multi-client workspace isolation in the same way, which can be a limitation for agencies managing a large number of distinct client campaigns simultaneously.

Which Platform Should You Choose?

Choose Icemail If...

You want official Google Workspace or Microsoft 365 mailboxes with automated setup, competitive per-mailbox pricing, and a flexible pay-as-you-go model. Icemail is the right choice if deliverability to Google and Microsoft inboxes is a priority, if you are managing multiple client campaigns and need workspace isolation, or if you want to avoid committing to a large tiered plan before your outreach volume is established. At $2.50 per mailbox for Google and $3.00 for Microsoft, it delivers native ESP infrastructure at a fraction of what those providers charge directly, without sacrificing the deliverability benefits that come with sending from recognized, official accounts.

Choose Mailforge If...

You need the highest possible inbox volume at the lowest possible per-mailbox cost and you already have warmup and deliverability monitoring handled. Mailforge is best used as a secondary infrastructure layer within a multi-ESP strategy, particularly by teams already invested in the Salesforge ecosystem. If you are an agency pairing Mailforge volume with Primeforge or Icemail native accounts to diversify sending risk and control costs at scale, Mailforge plays a clear supporting role. It is not the right standalone choice for teams prioritizing enterprise inbox placement or for anyone starting from scratch without a warmup workflow.

Choose Mailscale If...

You are scaling past 50 inboxes, want warmup included in the same platform, and prefer the simplicity of a tiered monthly plan over per-mailbox pricing. Mailscale's Enterprise tier at $249 per month becomes genuinely cost-efficient at higher inbox counts, and the built-in warmup removes one external tool from your stack. The platform is a solid choice for outbound-focused B2B teams and agencies that prioritize ease of setup and want a single vendor handling both inbox creation and inbox warming. Just be aware of the tier breakpoints and factor domain costs into your budget, as Mailscale requires domains to be purchased through the platform.

Why the Google/Microsoft vs SMTP Distinction Matters More Than Price

When most people compare cold email infrastructure tools, they lead with price. But the more consequential decision is infrastructure type, and it is worth spending a moment on why that matters before you make your final choice.

When you send from a Google Workspace or Microsoft 365 account, receiving mail servers recognize the sending infrastructure as one of the most trusted in the world. The IP reputation of those providers is built on billions of legitimate sends per day. This trust is transferable to your outbound emails in ways that shared SMTP infrastructure cannot replicate. If you are reaching out to prospects whose companies run on Google Workspace or Microsoft 365 themselves, sending from the same ESP category (known as ESP matching) can meaningfully improve inbox placement rates for those specific recipients.

Shared SMTP infrastructure is not inherently bad. Many successful outbound programs operate on it. But it introduces a variable you cannot fully control: the behavior of other senders on the same IP pool. For teams where deliverability is a business-critical metric rather than a nice-to-have, building on native ESP infrastructure from the start is a lower-risk approach even if it costs slightly more per inbox. Before making the final decision, understand cold email delivery metrics vs deliverability metrics. 

Final Verdict

The right choice between Icemail, Mailforge, and Mailscale depends on your infrastructure priorities, your current outreach scale, and how much weight you place on deliverability vs cost optimization. Here is the plain-language summary:

If you want native Google/Microsoft infrastructure with flexible pricing, no minimum commitment, and automated setup that covers both ESP types, Icemail is the most versatile option in this comparison. It serves solo founders, growing teams, and agencies without locking you into a plan that may not fit your volume six months from now.

If you are already inside the Salesforge ecosystem or want the lowest per-mailbox rate for high-volume shared infrastructure as a secondary layer, Mailforge delivers on cost efficiency. Factor in warmup separately and use it as part of a diversified strategy rather than your sole infrastructure.

If you are scaling to 50 or more inboxes and want warmup bundled in at a predictable monthly cost, Mailscale offers clean tiered simplicity. Watch the breakpoints and verify domain pricing before you subscribe.

Infrastructure is not where you want to compromise. Your sending reputation, once damaged, takes weeks to rebuild and also affects good reply rates for cold email. Getting the foundation right from the start is the most reliable way to ensure that the effort you put into your email copy, targeting, and follow-up sequences actually pays off.  

Frequently Asked Questions

1. Is Icemail a good Mailforge alternative for agencies?

Yes. Icemail is one of the strongest Mailforge alternatives for agencies because it provides official Google Workspace and Microsoft 365 mailboxes with automated DNS setup, separate workspace accounts per client, and flexible per-mailbox pricing with no minimum commitment. Unlike Mailforge, Icemail's native ESP infrastructure means your sending reputation is not tied to a shared IP pool that could be affected by other users' behavior.

2. What is the difference between Mailforge and Primeforge?

Mailforge uses shared SMTP infrastructure at a lower per-mailbox cost of around $2 to $3 per slot per month, making it fast and affordable but dependent on a shared IP pool. Primeforge, also part of the Salesforge ecosystem, provisions official Google Workspace and Microsoft 365 mailboxes at $3.50 to $4.50 per mailbox per month, offering native ESP infrastructure with better enterprise deliverability but at a higher price.

3. Does Mailscale include email warmup?

Yes. Mailscale includes built-in warmup functionality across all its plans, which is one of its main advantages over Mailforge. Mailforge does not include warmup by default and requires either a Salesforge subscription for free Warmforge access or a separate warmup tool purchase. Icemail includes pre-warmed mailboxes as part of its provisioned infrastructure.

4. Which cold email infrastructure provider is best for deliverability to Google inboxes?

For maximum deliverability to Gmail and Google Workspace inboxes, using a native Google Workspace mailbox provider like Icemail or Primeforge gives you the most trust signals. Since you are sending from the same ESP as the recipient (ESP matching), Google's filters recognize the infrastructure as inherently legitimate. Shared SMTP tools like Mailforge and Mailscale can still achieve good results, but they carry more variability depending on the shared IP pool's reputation at any given time.

5. Can I use Mailscale, Mailforge, or Icemail with Instantly or Smartlead?

Yes, all three platforms integrate with popular cold email sending tools. Icemail offers one-click CSV export for Instantly, Smartlead, and other platforms. Mailforge inboxes are compatible with any sending tool that accepts SMTP credentials. Mailscale exports a CSV of IMAP/SMTP credentials that plug directly into Instantly, Smartlead, and similar tools. None of these three platforms is a sending tool itself, so you will continue to use your existing sequencing platform regardless of which infrastructure provider you choose.