vs
InboxKit vs Infraforge: Real Costs
We compared InboxKit and Infraforge on pricing, dedicated IP options, mailbox types, and deliverability tools for cold email infrastructure.
The Verdict
Both offer dedicated IP infrastructure, but InboxKit bundles it into a flat $2.50 per mailbox rate with Google Workspace and Microsoft 365 options. Infraforge charges $3-$4 per SMTP mailbox plus $99/mo for the dedicated IP add-on, making it significantly more expensive at scale. InboxKit delivers more for less.
InboxKit vs Infraforge
| Feature | InboxKit | Infraforge |
|---|---|---|
| Pricing | ||
| Price per Mailbox | $2.50/mo Flat rate, all features included | $3-$4/mo Per-mailbox rate before add-ons |
| Dedicated IP Cost | Included US-based IPs included in the per-mailbox rate | $99/mo extra Dedicated IP is a $99/mo add-on |
| Cost for 100 Mailboxes | $250/mo 100 x $2.50, all tools included | $350-$499/mo 100 x $3.50 avg + $99 dedicated IP |
| Infrastructure | ||
| Mailbox Types | GWS + M365 + Azure Google Workspace, Microsoft 365, and Azure | SMTP only Dedicated IP SMTP mailboxes |
| Multi IP Provisioning | Not specified IP allocation details not published | Yes Provision multiple dedicated IPs |
| Deliverability | ||
| Pre-warmed Domains | Built-in warmup Warmup tool included in platform | Yes Pre-warmed domains for faster ramp-up |
| Inbox Placement Testing | Yes Built-in placement testing | No Not available natively |
| Email Verifier | Yes Built-in email verification | No Not available natively |
| Features | ||
| Masterbox | Dedicated panel per domain Domain-level monitoring panels | Yes Centralized masterbox for management |
| Domain Masking | Not specified Not mentioned | $2/domain/mo SSL and domain masking at $2 per domain per month |
Protect your mailbox investment with dedicated IPs, AI warmup, and auto mailbox protection. Increase mailbox longevity.
Total Cost Comparison
The pricing gap between InboxKit and Infraforge is significant at scale. InboxKit charges a flat $2.50 per mailbox with everything included. Infraforge charges $3 to $4 per mailbox plus $99 per month for dedicated IP infrastructure, plus $2 per domain per month for SSL and domain masking.
At 100 mailboxes across 20 domains: InboxKit costs $250/mo. Infraforge costs roughly $350 (100 x $3.50 average) + $99 (dedicated IP) + $40 (20 domains x $2 masking) = $489/mo. That is nearly double for SMTP-only mailboxes versus InboxKit Google Workspace and Microsoft 365 mailboxes with full deliverability tools.
Key takeaways
- 100 mailboxes: InboxKit $250/mo vs Infraforge ~$489/mo
- InboxKit includes all deliverability tools in the flat rate
- Infraforge adds $99/mo for dedicated IP plus $2/domain/mo for masking
- InboxKit is nearly half the cost at 100 mailboxes
IP and Mailbox Quality
Both providers offer dedicated IP infrastructure, but the implementation differs. InboxKit provides US-based IPs bundled with Google Workspace, Microsoft 365, and Azure mailboxes. The combination of dedicated IPs with recognized email provider mailboxes gives strong deliverability signals.
Infraforge provides dedicated IP SMTP mailboxes with multi IP provisioning. You can allocate multiple IPs across your mailbox fleet, which is useful for isolating different campaigns or client accounts. Pre-warmed domains reduce ramp-up time.
The masterbox feature centralizes management. The trade-off is clear: InboxKit gives you better mailbox types at a lower cost. Infraforge gives you more granular IP control at a higher cost.
Key takeaways
- InboxKit: US IPs + GWS/M365/Azure mailboxes
- Infraforge: dedicated SMTP IPs with multi IP provisioning
- InboxKit: better mailbox types at lower cost
- Infraforge: more granular IP control at higher cost
Which One Should You Choose
Choose InboxKit in almost every scenario. It costs less, offers more mailbox types, and includes a full deliverability stack. The only reason to choose Infraforge over InboxKit is if you specifically need SMTP mailboxes with multi IP provisioning and granular IP allocation, or if you are already deep in the Salesforge ecosystem.
For most cold email teams, InboxKit paired with SendKit gives you the strongest infrastructure-to-sending pipeline at the best price.
Key takeaways
- InboxKit wins on price, mailbox types, and deliverability tools
- Infraforge only wins on multi IP provisioning and Salesforge ecosystem fit
- InboxKit + SendKit is the recommended infrastructure-to-sending pipeline
Pros & Cons
InboxKit
Strengths
- Nearly half the cost of Infraforge at 100 mailboxes
- Google Workspace + Microsoft 365 + Azure vs SMTP only
- Built-in warmup, placement testing, verifier, blacklist checker
- US-based IPs included in the flat per-mailbox rate
- No separate add-on fees for IP or masking
Limitations
- No multi IP provisioning feature mentioned
- Less granular IP allocation control
- Not part of the Salesforge ecosystem
Infraforge
Strengths
- Multi IP provisioning for granular campaign isolation
- Pre-warmed domains for fast ramp-up
- Masterbox for centralized management
- Upgrade path from Mailforge (shared to dedicated)
- API access for automation
Limitations
- Significantly more expensive at scale ($489/mo vs $250/mo at 100 mailboxes)
- Dedicated IP costs $99/mo extra on top of per-mailbox pricing
- SSL and domain masking adds $2/domain/mo
- SMTP only, no Google Workspace or Microsoft 365
- No built-in deliverability monitoring tools
Protect your mailbox investment with dedicated IPs, AI warmup, and auto mailbox protection. Increase mailbox longevity.
Got questions? We've got answers.
Yes, significantly. At 100 mailboxes, InboxKit costs $250/mo. Infraforge costs approximately $489/mo including per-mailbox fees, dedicated IP ($99/mo), and domain masking. InboxKit also includes deliverability tools that Infraforge does not.
Ready to hit primary?
Set up SendKit's isolated infrastructure and start sending in under 15 minutes.
Dedicated IPs on every plan. Cancel anytime.