Mailforge vs Instantly (2026): Which One Do You Actually Need?

Short version: Mailforge and Instantly are not the same type of product. Pick Mailforge if you already have a sender (Smartlead, Saleshandy, your own tool) and just need cheap SMTP mailboxes. Pick Instantly if you want a complete outreach platform that handles campaigns, inbox rotation, CRM, and warmup in one place. If you want real Google Workspace or Microsoft 365 accounts with the infrastructure tooling a real sender needs, neither product is a great standalone fit.

	Mailforge	Instantly
Category	Mailbox infrastructure	Cold email sender platform
Mailbox type	Shared-IP SMTP	Real Google Workspace (add-on)
Microsoft 365	Not available	Not available
Starting price	$60/mo for 10 slots (yearly)	$47/mo Growth plan
Warmup	Warmforge sold separately	Unlimited, bundled
Sequencer / sender	Bring your own	Bundled
Lead database	None	450M+ B2B leads
Monitoring	Mailbox Heat Score (basic)	Placement testing bundled
Best for	Agencies pairing with their own sender	Solo operators wanting an all-in-one stack

If you're comparing the two to decide which buys you a cold email setup out of the box, Instantly wins by default because it actually ships a sender. If you're comparing them on price-per-mailbox, Mailforge wins by default because Instantly charges for the software, not the inbox.

This is where most comparisons get confused. Mailforge and Instantly are not in the same category.

Mailforge is part of the Salesforge Forge Stack. Mailforge for shared-IP SMTP mailboxes, Primeforge for real Google/Microsoft accounts, Infraforge for dedicated IPs, and Warmforge for warmup. Mailforge itself ships mailbox infrastructure: domains, SMTP inboxes, automated DNS (SPF, DKIM, DMARC, tracking), bulk DNS updates, workspaces, and a basic Mailbox Heat Score. It does not ship a sequencer, a CRM, or a unified inbox. You plug Mailforge into your existing cold email software.

Instantly is a cold email outreach platform. The core product is software: a sequencer, CRM, unified inbox, 450M+ B2B lead database, AI campaign builder, warmup pool, and placement testing. Instantly sells email accounts as an add-on: real Google Workspace accounts with automated DNS and US IPs, delivered 24 to 72 hours after purchase. There are no Microsoft 365 accounts and no shared-IP SMTP.

The Reddit user who wrote 'don't use Salesforge/Mailforge, sending cold emails from an SMTP server is a bad idea' was half right and half wrong. Mailforge shared-IP SMTP isn't ideal for sensitive B2B outreach, but it's also not what Instantly is competing with. Instantly competes with Smartlead, Lemlist, and Apollo. Mailforge competes with Maildoso, Zapmail, and Primeforge on the infrastructure layer.

Mailforge pricing (from the Mailforge pricing page):

• Minimum purchase: 10 mailbox slots.
• Monthly billing: $75/mo for 10 slots ($7.50 per mailbox).
• Yearly billing: $60/mo for 10 slots ($6 per mailbox, paid annually).
• Headline rate ($2/mailbox): only applies at ~200+ mailboxes on yearly billing, where $484/mo divided by 200 mailboxes gives $2.42 effective.
• Domain cost: $14/year per .com, billed separately.
• SSL and domain masking: $2/domain/month as an optional add-on.
• Warmup: not bundled. Warmforge is a sibling product at roughly $10/slot/mo standalone, free only when you also buy the Salesforge sequencer.

So a 30-mailbox Mailforge setup on yearly billing costs about $180/mo for the mailboxes, plus $42/year for the three domains most teams use, plus $300/mo if you add Warmforge warmup. Total: around $480/mo to send from 30 shared-IP accounts, with warmup.

Instantly pricing (verified from instantly.ai/pricing):

• Growth: $47/mo: unlimited email accounts, unlimited warmup, 1,000 contacts, 5,000 emails/mo.
• Hypergrowth: $97/mo: unlimited accounts and warmup, 25,000 contacts, 100,000 emails/mo.
• Light Speed: $358/mo: 100,000+ contacts, 500,000+ emails/mo, SISR (Server and IP Sharding and Rotation).
• Instantly Credits (lead DB + AI tools): $47/mo Growth tier with 1,500-2,000 monthly credits and access to the 450M+ B2B lead database.
• Email accounts: sold separately as an add-on. Real Google Workspace only, 24-72h setup, US IPs, per-account pricing.

Instantly's $47 headline gets you the software. Running 30 mailboxes inside Instantly means buying 30 Google Workspace slots on top, and Instantly doesn't publish that add-on price on the main pricing page, you see it when you order accounts. Real-world reports from Instantly users put it in the $6-10/mailbox/month range, which matches direct Google Workspace Business Starter pricing ($7.20/mo billed through Google).

Apples-to-apples at 30 mailboxes sending 40 emails/day, yearly billing, with warmup and software:

Instantly is cheaper if you have no sender. Mailforge is cheaper only if you already pay for a sender and you're willing to run shared-IP SMTP instead of real Google accounts.

This is the part most comparisons skip.

Mailforge sends from shared-IP SMTP infrastructure. That means you share an outbound IP with other Mailforge customers. If one of them runs aggressive sequences or gets blacklisted, you inherit the blast radius until the IP rotates you off. Mailforge publishes a Mailbox Heat Score metric to flag individual mailboxes whose reputation is drifting, but there's no ongoing blacklist detection product at the Mailforge layer, that lives over in Infraforge and Warmforge. Gmail and Outlook classify non-Google sending origins more aggressively than real Google accounts, and the gap shows up in placement rates.

Instantly sells real Google Workspace accounts with a managed setup process (SPF, DKIM, DMARC, MX) and US IPs. Deliverability on fresh accounts typically benchmarks 10-20 points higher than shared-IP SMTP at 30-day horizon, mostly because Gmail recognizes Google-to-Google sending paths natively. Instantly also ships an Inbox Placement Testing product that monitors 400+ blacklists and runs SpamAssassin checks, plus a 1,000,000+ account deliverability pool that powers the unlimited warmup. This is the biggest Instantly advantage over Mailforge as a standalone product.

The catch: Instantly's accounts are still shared infrastructure under the hood. Every Instantly user running Google Workspace is part of the same delivery pool. SISR (Server and IP Sharding and Rotation) on the Light Speed tier is Instantly's answer to noisy neighbors, but SISR costs $358/mo. On Growth ($47/mo), you're in the general pool. This is why operators running large campaigns tend to upgrade to SISR or move to dedicated infrastructure.

Rough inbox placement expectations at 30 days, identical content:

• Mailforge shared SMTP: 58-68% inbox
• Instantly real Google on Growth: 72-80% inbox
• Real Google Workspace with isolated warmup and monitoring: 80-88% inbox

Exact numbers depend on domain age, warmup length, sending volume, and list quality. The direction is consistent across tests: real Google accounts beat shared SMTP by 10-20 points, and isolated warmup beats shared warmup pools by another 5-8 points on top.

Mailforge doesn't ship:

• A sequencer or sender
• A CRM or unified inbox
• Any lead database
• Microsoft 365 accounts (those live in Primeforge)
• Dedicated IPs (those live in Infraforge)
• Bundled warmup (that lives in Warmforge)
• Azure mailbox provisioning (nobody in the Forge product line offers this)
• Fine-grained placement testing (basic Heat Score only)

Instantly doesn't ship:

• Microsoft 365 mailboxes (Google Workspace only)
• Shared-IP SMTP (they removed this pathway)
• Dedicated per-customer IPs below the Light Speed tier
• Azure mailbox provisioning
• Bring-your-own-domain-registrar flexibility (domains come from the Instantly flow)
• A standalone infrastructure API, the API is for campaigns, not for provisioning mailboxes like Primeforge or Infraforge do

If you need any of the things in both lists. Microsoft 365, Azure mailboxes, dedicated IPs, deep monitoring, you're going to outgrow whichever side you pick. That's not a reason to avoid them, but it's a reason to plan for the upgrade path up front.

Setup A: Mailforge inside Smartlead or Saleshandy. Buy Mailforge shared-IP mailboxes at $6/mailbox on the 10-slot tier, plug them into Smartlead ($39/mo) or Saleshandy, run campaigns from there. Total cost for 30 mailboxes: roughly $180 Mailforge + $39 Smartlead + $300 Warmforge = $519/mo. You get a real sequencer, unified inbox, and warmup, but you're still on shared-IP SMTP for deliverability.

Setup B: Instantly with Google Workspace accounts. Buy the Growth plan at $47/mo, add 30 Instantly-provided Google accounts at roughly $7/mailbox/mo = $210/mo, warmup bundled. Total: around $257/mo. You get real Google accounts, a sequencer, and a warmup pool, but you're locked into Instantly's platform and there's no Microsoft 365 option.

Setup C (the one nobody on the SERP explains): Some agencies run both. Mailforge mailboxes inside the Instantly sender for cheap sending slots, plus Instantly's Google accounts for high-value campaigns. This works because Instantly accepts third-party SMTP accounts via the connect flow. It's messy, it doubles your billing, and most teams outgrow it in six months, but it exists.

Setup B wins on raw cost and simplicity unless you already have a sender you love. Setup A wins when you need more than one sender connected to the same mailbox pool. Setup C exists mostly as a transition state.

Pick Mailforge if at least three of the following are true:

1. 1You already pay for a sender you like (Smartlead, Saleshandy, Lemlist, or a custom tool).
2. 2You send from 50+ mailboxes and the per-mailbox price dominates your P&L.
3. 3Your campaigns are low-intent B2B where a 15-point deliverability gap is tolerable.
4. 4You want full domain ownership and the ability to transfer domains out later.
5. 5You're already inside the Salesforge Forge product line (Warmforge for warmup, Infraforge for dedicated IPs, etc.) and the stacking discount math works for you.
6. 6You don't need Microsoft 365 mailboxes (Mailforge doesn't offer them, that's what sibling product Primeforge is for).

Mailforge is a rational pick for price-sensitive agencies running volume-first cold outreach. It's the wrong pick if you're sending to enterprise buyers, if you need Microsoft 365, or if you don't have a sender you already trust.

Pick Instantly if at least three of the following are true:

1. 1You want one tool that handles sequencing, warmup, accounts, and lead generation without integrating five services.
2. 2You're starting from zero and need a sender you can launch this week.
3. 3You're fine with Google Workspace only (no Microsoft 365 coverage).
4. 4You value the 450M+ B2B lead database and the AI campaign builder.
5. 5You're willing to pay $358/mo for Light Speed when you scale past shared-infrastructure limits.
6. 6You don't need per-domain SSL masking or aged domains (Instantly doesn't ship those).

Instantly is the better pick for solo operators and early-stage teams who'd rather pay $257/mo for one tool than $519/mo for a stitched-together stack. It becomes less competitive at agency scale once you need Microsoft 365 coverage, dedicated IPs below Light Speed, or real monitoring beyond the built-in placement testing.

There's a third category that neither Mailforge nor Instantly covers well: teams who want real Google Workspace and real Microsoft 365 and Azure mailboxes, with isolated warmup, deep monitoring, and native sequencer integrations. That's where InboxKit sits.

InboxKit ships real Google Workspace and Microsoft 365 mailboxes on US IPs, plus Azure mailboxes at $30 per tenant for up to 100 mailboxes (the Azure option is unique: no other provider in this category does it). Plans start at $39/mo for 10 mailboxes on Professional, $99/mo for 30 on Agency, $299/mo for 100 on Enterprise. Isolated warmup is $3/mailbox/month as an add-on. InfraGuard monitoring runs blacklist checks every 6 hours, watches DNS changes, tracks bounce rates, and auto-pauses burned mailboxes: functionality that Mailforge doesn't ship and that Instantly only partially covers.

The 24+ native sequencer integrations mean you can plug InboxKit mailboxes into Instantly, Smartlead, Saleshandy, Lemlist, or any other platform without the SMTP-account dance. That's the feature most cold email teams actually want, the ability to treat mailboxes as a layer separate from the sender.

InboxKit isn't the right pick if you're price-shopping below $2/mailbox at 500+ volume (Mailforge beats it there), and it's not the right pick if you want a bundled sender like Instantly provides. But if you're staring at the Mailforge-vs-Instantly question and suspect neither product actually solves your problem, it's probably because you're buying from the wrong category.

Rough totals for a 30-mailbox setup running for six months, including warmup, sender software, and replacement mailboxes for expected churn:

These numbers assume yearly billing on Mailforge and InboxKit, monthly billing on Instantly's Growth plan (since that's how most people buy it), and standard churn rates of ~10% per quarter across shared-IP infrastructure. Dedicated-IP setups (Infraforge, Instantly Light Speed) land higher on all three stacks: add ~$350/mo per 30 mailboxes if you need them.

The Mailforge stack being the most expensive surprises people who assume the cheapest per-mailbox price wins. Once you add sender software and warmup separately, the discount disappears.