vsIMaildoso vs Infraforge: What You Actually Pay
A comparison of Maildoso and Infraforge on price, shared versus dedicated IPs, and features, to help you decide which fits your cold email setup.
Maildoso and Infraforge are independent third-party mailbox providers, neither is a Sendbox product. This comparison is based on each provider's publicly listed pricing and features.
The verdict
Maildoso has the cheapest mailboxes in this pairing, starting at $1.90/mo on shared IPs. Infraforge charges $3-$4/mo for dedicated-IP SMTP, plus a $99/mo fee for the IP itself. Pick Maildoso if budget efficiency is the priority; pick Infraforge if sender isolation is.
Worth a look as a third option: InboxKit's tiered plans (Professional $31 for 10 slots, Agency $81 for 30, Enterprise $250 for 100) pair Google Workspace with bundled deliverability tooling.
Scoreboard
Which provider has the edge on each of the 9 rows in the table below.
A count of rows, not a weighted score, read the verdict for which differences matter most.
Feature comparison
Maildoso vs Infraforge, row by row
| Feature |  Maildoso | Infraforge |
|---|---|---|
| Price per MailboxPricing | $1.90-$2.50/mo Edge SMTP starts at $1.90; the Combo option runs $2-$3. | $3-$4/mo SMTP mailboxes on dedicated IP infrastructure. |
| IP InfrastructureInfrastructure | Shared IPs Runs on shared IP pools. | Dedicated IPs Edge Dedicated IPs, billed at $99/mo extra. |
| Dedicated IP CostPricing | Not available No dedicated IP option exists. | $99/mo Edge The dedicated IP is a $99/mo add-on. |
| Pre-warmed DomainsDeliverability | No Warmup needs to come from your sending tool. | Yes Edge Domains arrive pre-warmed. |
| Scale Track RecordScale | 400K+ mailboxes Edge 400K+ mailboxes managed, 10M+ emails sent daily. | Part of Salesforge Scale figures come from the wider Salesforge ecosystem. |
| G2 RatingSocial Proof | 4.7 (159 reviews) Edge Backed by verified G2 reviews. | Not listed No G2 rating of its own. |
| API AccessAutomation | API + MCP Edge Full API access plus MCP protocol support. | Yes API access is available. |
| Multi IP ProvisioningInfrastructure | No Not offered on a shared-IP setup. | Yes Edge You can provision multiple dedicated IPs. |
| Cost for 100 MailboxesPricing | $190-$250/mo Edge 100 mailboxes at $1.90-$2.50 each, no fees on top. | $350-$499/mo 100 mailboxes averaging $3.50 each, plus the $99 IP fee. |
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Cost Comparison
The cost gap between them is substantial. At 100 mailboxes, Maildoso runs $190 to $250/mo. Infraforge runs roughly $350 to $400 for the mailboxes plus $99 for the dedicated IP, totaling $449 to $499/mo, close to double.
For teams that want Google Workspace or Microsoft 365 mailboxes with deliverability tooling bundled in, InboxKit's Enterprise tier offers 100 mailbox slots at $250/mo (an effective $2.50 per mailbox), with US-based IPs and the verifier, placement testing, and blacklist checker all included. Email Warmup remains a separate $3/mailbox add-on if you want it.
Key takeaways
- At 100 mailboxes: Maildoso ~$220/mo against Infraforge's ~$450/mo
- The dedicated IP add-on roughly doubles Infraforge's bill
- InboxKit sits in between: $250/mo with dedicated IPs and GWS included
Maildoso vs Infraforge: Which One Fits Your Use Case
Go with Maildoso if the cheapest infrastructure is the goal and shared IPs don't worry you. Pairing it with Sendbox for warmup and monitoring helps offset the shared-IP risk. Go with Infraforge if you need dedicated IP isolation for high-volume campaigns or sensitive domains, the extra spend buys genuine reputation protection.
InboxKit is worth weighing as a third path: tiered pricing (Professional $31 for 10 mailboxes, Agency $81 for 30, Enterprise $250 for 100), US-based IPs, and Google Workspace or Microsoft 365 mailboxes. It undercuts Infraforge at every comparable tier and bundles in more than Maildoso does (verifier, placement testing, and blacklist checker included; warmup is a $3/mailbox add-on).
Key takeaways
- Maildoso: cheapest path, shared IPs, pair with Sendbox for warmup
- Infraforge: dedicated IPs for high-volume sender isolation
- InboxKit: best value if you want dedicated IPs plus deliverability tooling
Strengths and limitations
Pros & cons
Strengths5
- Cheapest per-mailbox pricing, starting at $1.90/mo
- 400K+ mailboxes managed, a genuine scale record
- 4.7-star G2 rating from 159 verified reviews
- API and MCP support for automation
- A Google Workspace Combo tier is available
Limitations4
- Runs on shared IPs only
- No dedicated IP option on offer
- Domains aren't pre-warmed
- No native deliverability tooling
Strengths5
- Dedicated IPs deliver genuine sender isolation
- Domains arrive pre-warmed for a faster ramp
- Supports multi-IP provisioning
- API access plus a masterbox console
- A natural upgrade path from Mailforge
Limitations5
- Notably more expensive at scale
- The dedicated IP adds $99/mo on its own
- SSL and domain masking cost another $2 per domain
- SMTP-only, with no Google Workspace
- No native deliverability tooling
Using either provider with Sendbox
Both providers connect to Sendbox, which handles AI warmup, campaign management, and deliverability monitoring regardless of which one you pick. Sendbox also makes migrating from Instantly, Smartlead, or EmailBison straightforward via API key.
- Mailboxes can be provisioned right inside Sendbox, no manual setup, live in about 30 minutes
- Every plan runs on dedicated IPs with isolated infrastructure
- Plays nicely with any of the infrastructure providers above (InboxKit, Maildoso, Zapmail, Mailforge)
- Migrating from Instantly, Smartlead, or EmailBison takes an API key, not a rebuild
- A 350M+ lead database comes with the platform
- Dialer, CRM, and AI reply tagging are built in rather than bolted on
- Pricing is not per seat
Yes, considerably so. Maildoso starts at $1.90/mailbox with no extra fees, while Infraforge starts at $3/mailbox plus $99/mo for the dedicated IP. At 100 mailboxes, that's roughly $220/mo on Maildoso versus $450/mo on Infraforge.
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