Mailforge Pricing 2026: Plans, Add-Ons and Real Cost

Mailforge charges $3 per mailbox slot a month on monthly billing, falling to $2 above 1,000 add-on slots, or $30 per slot a year (about $2.50 a month) on yearly billing. The minimum is 10 slots, $30 a month. Warmup and sending are not in the price: they are separate Forge products (Warmforge and Salesforge) or another tool. Domains are $14 a year, and SSL with domain masking is $2 per domain a month.

Prices below are from mailforge.ai/pricing and the plan calculator on that page, checked September 28, 2026.

Mailforge Plans and Prices

Mailforge has no named plans. It sells slots for SMTP mailboxes on shared infrastructure, and the price per slot depends on how many you buy.

The monthly price falls by $0.10 for every 100 add-on slots. Per the calculator, the first 10 slots are always billed at $3, and the number of slots above 10 sets the tier for the rest. You pay for every slot you buy, including empty ones: "If you purchase 10 slots but only create 5 mailboxes, you are still charged for all 10 slots."

Yearly billing gives 2 months free on slots. There is no discount on domains.

What the Slot Price Includes

• SMTP mailboxes on a shared IP pool. Google and Microsoft mailboxes are Primeforge, and dedicated IPs are Infraforge, both separate Forge products.

• Automated DNS setup (SPF, DKIM, DMARC) and a tracking domain.

• Inbox hosting and maintenance, and support.

• A public API and an MCP server.

Not included: warmup, a sequencer and placement tests. The pricing FAQ says each Forge product is billed on its own: "At the moment, you will need to subscribe to each product you want to use separately."

Costs on Top of the Slot Price

There is no free trial: "we don’t offer a free trial, however, you are free to explore the app without any domains and mailboxes after signing up." There is no contract, and you can cancel any time. The pricing page does not state a refund policy.

What Mailforge Costs at 25, 100 and 400 Mailboxes

Monthly cost on monthly billing, from the slot tiers above. The full setup adds warmup and a sequencer: we use the cheapest Instantly plan that covers 25 emails a day per mailbox (method), because Instantly includes warmup in the plan. Domains and masking are left out.

The 400-slot line is 10 slots at $3 plus 390 add-on slots at $2.70. With Warmforge instead of Instantly warmup, add its per-slot price (at 25 slots, $11 a month billed monthly or $9 billed quarterly), unless you send through Salesforge, which includes Warmforge. With SSL and domain masking on every domain, add $2 per domain a month. On yearly billing the slot cost drops by a sixth ($62.50 a month for 25 slots).

Mailforge vs Outreach2day

At every size in the table, the full setup costs less with Outreach2day: $250 against $397 at 100 mailboxes, before Mailforge's $2 per domain for masking, which we include. Mailforge's slot reaches $2.50 only on yearly billing, without warmup or sending. Both minimums are $30 a month: 10 slots at Mailforge, 12 mailboxes with us. Both sell SMTP mailboxes. For Google or Microsoft mailboxes, Forge sells Primeforge; we have no such option. The side-by-side is at Outreach2day vs Mailforge, other options are in Mailforge alternatives, and Mailforge against nine other vendors is in our ranking of cold email infrastructure tools.

The Mailforge review covers the shared-IP trade-off, the Forge MCP server and the cancellation rule. Its sister product with dedicated IPs is compared in Mailforge vs Infraforge, and a Google and Microsoft seller in Mailforge vs InboxKit.

FAQ

How much does Mailforge cost per mailbox?

$3 a month per slot on monthly billing for up to 110 slots, falling by $0.10 per 100 extra slots to $2 above 1,000 add-on slots. Yearly billing is $30 per slot a year (about $2.50 a month), down to $20.

Does Mailforge include warmup?

No. Warmup is Warmforge, a separate product with per-slot pricing. Salesforge subscribers get unlimited Warmforge slots.

How much are Mailforge domains?

$14 a year for a .com, charged once a year. You get full DNS control, "the same as if you had purchased from another registrar."

Is there a free trial?

No. You can explore the app after signing up without buying domains or mailboxes. There is no contract, and you can cancel any time.

Sources

Checked September 28, 2026:

• Mailforge pricing: slot prices, calculator tiers, masking, domains, trial.

• Mailforge home page: mailbox type, sending tools.

• Mailforge API: API and MCP.

• Warmforge pricing: warmup slots and placement tests.