Infraforge vs Mission Inbox (2026): which should you pick?

Pick Infraforge if

• Fits if you send cold email at volume and want dedicated IPs
• Works for agencies managing many domains through an API

Look elsewhere if

• Skip it if you want a sending tool, because you still need one
• Pricey if you add an IP, at $99 a month each
• Watch out: slots are billed whether or not a mailbox is created in them
• Not for you if you want a trial: there isn't one

Pick Mission Inbox if

• Fits if you want dedicated IPs for outbound and already own a sequencer
• Works for agencies that keep each client's sending apart

Look elsewhere if

• Not for you if you want to write or schedule campaigns, because there is no sequencer
• Tight if you send past 5,000 a month, since Lite pauses at the limit, counts warm-up emails and has no overage billing
• Skip it if you want a trial, as none is offered
• Pricey if you add warm-up, which is a paid add-on, or move to Scale at $199 a month

Infraforge

• Slots are billed whether or not a mailbox is created in them, with a minimum of 10.
• Domains are bought separately; the calculator prices .com at $14 a year, charged once, with no annual discount on domains.
• Extra add-ons cost more: $99 a month per additional IP address, $2 per domain a month for SSL and domain masking, and $7 to $9 per workspace a month for Masterbox.
• There is no free trial, and each Forge product is a separate subscription.

Mission Inbox

• It is infrastructure only: there is no sequencer, so you need another tool to write and schedule campaigns.
• Lite is a fixed plan with no overage billing; at 5,000 sends, counting warmup emails, you have to move to Scale.
• Premium Warmups are a paid add-on, and sends include warmup emails.
• Pricing is a monthly rate; the calculator shows prepaid-monthly (10% off) and annual (17% off) options.

Infraforge

Dedicated servers and IPs

Mailboxes send from dedicated servers, in contrast with Mailforge's shared IP pool; extra IP addresses can be added.

Automated DNS setup

DKIM, SPF and DMARC records are configured for each domain, with bulk DNS updates inside the app.

Warm-up and monitoring

The page lists automated warm-up, real-time deliverability monitoring and alerts, sender rotation and smart sending limits.

API, MCP and CLI

The Infraforge API is included with the subscription and can manage domains and mailboxes programmatically.

Pre-warmed mailboxes

Pre-warmed infrastructure is offered for sending right away.

Workspaces and Masterbox

Multiple workspaces, plus a Masterbox add-on that shows all emails across a workspace's accounts in one view.

Mission Inbox

Dedicated IP addresses

Each mailbox sends from IP addresses reserved for the account instead of a shared pool, so other senders' habits do not affect its reputation.

MI Shield pre-send scan

The vendor's own AI checks content, headers and DNS before each outbound send to catch problems before a campaign goes live.

Automatic DNS and mailbox setup

Mailboxes are created in one step and DNS records are configured automatically, so they can be connected to a sequencer afterwards.

Cubes for separating clients

Cubes split clients, brands and campaign workloads into separate sending environments, which matters for agencies.

Premium warmup add-on

Mailbox warmup is a paid add-on, billed in credits per mailbox. You can instead warm up with your own tool or skip warmup.

API and SMTP access

An API and SMTP sending give campaign or product email traffic its own sending reputation, with documentation linked from the site.

Infraforge

• Mailbox slots$4

  per mailbox slot / month, billed quarterly, 10-slot minimum

  Slots are charged whether or not a mailbox is created. The calculator shows 25 slots at $100 a month billed quarterly, or $83 a month billed yearly.

Mission Inbox

• Lite$50

  per month for 15 mailboxes and 5,000 sends

  Dedicated IP addresses, MI Shield protection, analytics and sending logs. A fixed plan: it pauses at the send limit until you move to Scale.

• Scale$199

  per month for 30 mailboxes and 10,000 sends

  Aimed at agencies and companies sending for clients. Dedicated IPs, MI Shield, analytics and logs; more mailboxes and sends can be added.

Infraforge

• Annual discount

  Two months free on annual mailbox billing

  The FAQ says annual billing for mailboxes gets 2 months free automatically; there is no discount on domains.

Mission Inbox

• Annual discount

  17% off with annual billing

  The pricing page calculator lists an annual option at 17% off and a prepaid monthly option at 10% off, against pay-as-you-go monthly.