Mailforge vs InboxKit: shared-IP SMTP in the Forge stack against Google and Microsoft from a wallet

They look similar on price and differ on everything else. Mailforge sells SMTP slots on shared IPs, 10 at least, with warm-up and sending in other Forge products. InboxKit sells Google Workspace and Microsoft 365 mailboxes one at a time, warm-up as a $3 add-on.

Create mailboxesBook a call
  • Warm-up and sending included
  • $2.50 a mailbox, 12 minimum
  • Month-to-month billing

Mailforge

InboxKit

Price per mailbox
from $1.67 (yearly, 1,000+ slots); $3 monthly on small ordersfrom $2.50 (annual billing); $3 monthly
Smallest order
10 mailbox slots, $30 a month, plus domainsNone; one mailbox
Mailbox types
SMTPGoogle, Microsoft
Warm-up
Not in Mailforge; Warmforge is a separate Forge productIsolated Warmup add-on, $3 a mailbox a month

Mailforge vs InboxKit, line by line

Each cell links to the vendor's page it comes from.

Mailforge and InboxKit prices

Mailforge

Mailforge plans and prices
PlanPriceMailboxesPer mailboxBillingIncludes
Mailbox slots, 1–100 add-on$3 a mailbox a month10 base + up to 100$3.00monthlyAutomatic DNS, hosting, support source (opens the vendor's page in a new tab)
Mailbox slots, volume tiers$2.90 down to $2.00 a mailbox101+ add-on slots, $0.10 less per 100$2.00–$2.90monthlyThe 10 base slots stay at $3 source (opens the vendor's page in a new tab)
SSL and domain masking$2 a domain a monthn/amonthlySSL redirect and masking source (opens the vendor's page in a new tab)

InboxKit

InboxKit plans and prices
PlanPriceMailboxesPer mailboxBillingIncludes
Google Workspace or Microsoft 365$3.00 a monthper mailbox, from 1$3.00monthlyAutomated DNS, an admin panel per domain, API with webhooks source (opens the vendor's page in a new tab)
Azure tenant$30 a monthup to 100 per tenant$0.30 at 100monthlyAzure-hosted Microsoft mailboxes source (opens the vendor's page in a new tab)
Isolated Warmup$3 a mailbox a monthper mailbox$3.00monthlyRamps from 2 to 40 emails a day source (opens the vendor's page in a new tab)

List prices from Mailforge's pricing page and InboxKit's pricing page, checked . Taxes and card fees excluded.

Cost at 25 mailboxes

Mailforge's calculator: $75 a month on monthly billing for 25 SMTP mailboxes, plus .com domains at $14 a year. Warm-up means a Warmforge subscription; sending means Salesforge or another sequencer.

InboxKit: $75 a month for 25 Google or Microsoft mailboxes on monthly billing, $62.50 on annual, plus $75 if every mailbox gets Isolated Warmup. Domains through InboxKit start at $2 a year. A sequencer is still extra.

At volume Mailforge pulls ahead on the slot price ($2.00 above 1,000 monthly), while InboxKit stays at $3.00 monthly whatever the count.

Where they differ

Shared SMTP or provider accounts

Mailforge mailboxes are SMTP/IMAP on IPs shared with other customers; Forge's help center says that makes deliverability depend partly on other users. InboxKit mailboxes are real Google Workspace or Microsoft 365 accounts, each domain with its own admin panel.

How you pay

Mailforge bills slots, used or not, monthly or yearly, and cancelling needs a chat request seven days before the term ends. InboxKit draws each mailbox from a prepaid wallet on its own renewal date. Neither refunds unused time.

API and AI agents

Both have REST APIs. Mailforge is also covered by the shared Forge MCP server; InboxKit has no MCP server we could find, but its API has webhooks.

Which one to pick

Pick Mailforge if

  • SMTP is fine for your list and you want the lowest slot price at volume
  • You already use Salesforge or Warmforge
  • You want MCP access to provisioning

Pick InboxKit if

  • You need Google Workspace or Microsoft 365 accounts
  • You need fewer than 10 mailboxes
  • You want webhooks on mailbox events

Where Outreach2day fits

We sell cold email mailboxes too, so this section is ours. The comparison above does not rank us.

Outreach2day is SMTP/IMAP like Mailforge, but warm-up and sending are in the $2.50 instead of two more subscriptions: 25 mailboxes cost $62.50 a month all in. We run an MCP server and a REST API. We sell no Google or Microsoft accounts, which is InboxKit's ground.

From 1,000 mailboxes Outreach2day quotes a volume price below the per-mailbox list price of every vendor in our comparisons, including Maildoso's $0.49, with warm-up and sending in the price. Book a call and we quote your volume.

Mailforge vs InboxKit: questions

Is Mailforge cheaper than InboxKit?

At 25 mailboxes on monthly billing both mailbox lines are $75. Mailforge gets cheaper with volume, down to $2.00 a slot; InboxKit stays at $3.00 monthly and $2.50 annual.

Which one sells Google Workspace?

InboxKit. Mailforge sells SMTP; Google and Microsoft are in Primeforge, another Forge product.

Do Mailforge or InboxKit include warm-up?

Neither in the mailbox price. Mailforge points to Warmforge; InboxKit sells Isolated Warmup at $3 a mailbox.

What are the minimums?

Mailforge: 10 slots. InboxKit: none.

Deliverability call

Talk to our deliverability team

Book a call with the people who run our mailbox infrastructure. We look at your current setup and tell you what to change. Running 1,000+ mailboxes? We also quote a volume price below every vendor list price in our comparisons, warm-up and sending included.

  • Review your domains, DNS records and current inbox placement
  • Size the setup: domains, mailboxes per domain and daily volume per mailbox
  • Plan warm-up and the move from your current provider or sequencer
  • 1,000+ mailboxes: a volume price per mailbox for your setup

Free call

See open times in your time zone and book on this page.

Or open the booking page

More on Mailforge and InboxKit

Sources

Each vendor's own pages. Vendors change prices and plans; if something here is out of date, write to support@outreach2day.com and we will fix it.

First cold emails on day 14, full volume on day 21

Add domains, create mailboxes and turn on warm-up. You see every mailbox's warm-up numbers from day one.

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