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Mailforge vs Primeforge (2026): Shared IP vs Real Google Mailboxes for Cold Email
By Saksham JainPublished on: Mar 30, 2026 · 14 min read · Last reviewed: Mar 2026
TL;DR
Mailforge offers shared IP mailboxes at $2/mo, Primeforge provides real Google/Microsoft at $3.50-4.50/mo. After a 60-day test, the deliverability gap is 16 points (63% vs 79%). InboxKit bridges the gap with plans from $39/mo for real accounts.
Quick Verdict
Mailforge: Shared IP (SMTP), $2-3/mo, 60-68% inbox placement, basic warmup, no monitoring, setup in minutes.
Primeforge: Real Google/Microsoft, Google $3.50/mo, Microsoft $4.50/mo, 76-82% inbox placement, partial warmup, basic monitoring, setup in days.
InboxKit: Real Google/Microsoft, Google $2.99/mo, Microsoft $2.99/mo, 80-85% inbox placement, AI warmup, InfraGuard monitoring, inbox testing.
| Tool | Pricing | Type | Warmup | Monitoring | Setup |
|---|---|---|---|---|---|
| InboxKit | $2.99/mo | Official Google/MS | $3/mo add-on | InfraGuard | 10 min |
| Mailforge | $2-3/mo | Shared IP | None | None | 15 min |
| Primeforge | $3.50-4.50/mo | Official Google/MS | Warmforge extra | Basic | 30 min |
| Feature |  Mailforge |  Primeforge |  InboxKit |
|---|---|---|---|
| Google Workspace | Not available | $3.50/mo | $2.99/mo |
| Microsoft 365 | $2-3/mo (shared IP) | $4.50/mo | $2.99/mo |
| Account Type | Shared IP (SMTP) | Real Google/MS | Real Google/MS |
| Warmup | Warmforge (extra) | Warmforge (extra) | $3/mo add-on (isolated) |
| Monitoring | Infraforge (extra) | Infraforge (extra) | InfraGuard |
| Inbox Testing | No | No | Included |
| Integrations | ~3 | ~4 | 24+ |
| Platform Fee | $0 | Varies | $0 |
| Inbox Placement | 60-68% | 76-82% | 80-85% |
| Setup Time | Minutes | Days | 10 min |
Deliverability: The Core Difference
60-day test with identical campaigns:
Mailforge: 63% inbox, 14% promotions, 23% spam. Varied wildly (54% to 72%). Primeforge: 79% inbox, 11% promotions, 10% spam. Consistent within 5 points.
16-point gap = 160 more delivered emails per thousand with Primeforge. Mailforge's deliverability varied wildly due to shared IP factors.
Winner: Primeforge, by a significant margin.
Cost Per Delivered Email
On 100 mailboxes sending 40 emails/day:
- Mailforge: $250/mo, 75,600 inbox deliveries, $0.0033/delivery
- Primeforge: $400/mo, 94,800 inbox deliveries, $0.0042/delivery
Mailforge is still cheaper per delivery. But the 19,200 additional inbox emails with Primeforge = ~576 extra replies and ~57 extra meetings at typical rates.
Winner: Primeforge for ROI, Mailforge for raw cost.
The Real Problem: Neither Platform is Complete
Mailforge gives affordable mailboxes but compromises on deliverability. 37% of emails miss the inbox.
Primeforge gives quality mailboxes but at premium prices with no monitoring tools.
Neither offers inbox placement testing or automated monitoring.
InboxKit: Bridging the Gap
InboxKit plans from $39/mo for 10 mailboxes (from $2.99/additional on Enterprise). Real Google + Microsoft infrastructure at competitive pricing vs both Mailforge and Primeforge.
InfraGuard monitors everything 24/7. Inbox placement testing built in. AI warmup produces faster, more reliable results.
6-Month TCO: 100 Mailboxes
Mailforge: $1,500 mailboxes + $375 replacements + $594 inbox testing + $4,550 monitoring + $1,500 failed campaigns = ~$8,519
Primeforge: $2,400 + $160 + $594 + $5,850 + $1,000 = ~$10,004
InboxKit: $1,800 + $60 replacements = ~$1,860
InboxKit's TCO is lowest by a wide margin despite not having the cheapest per-mailbox cost.
Frequently Asked Questions
Primeforge: 79% vs 63% inbox placement. InboxKit offers even better (80-85%) at competitive pricing (plans from $39/mo).
Shared IP infrastructure vs real Google/Microsoft accounts. Lower cost, but lower deliverability and shared reputation risk.
Yes. Many teams test messaging on Mailforge then upgrade to real mailboxes for production. InboxKit makes the upgrade cost-effective with plans from $39/mo.
All users on that IP are affected. Deliverability drops 20-30% overnight until resolved (24-72 hours).
Yes. Without it, you discover problems after sending thousands of emails. InboxKit's built-in testing lets you verify before every campaign.
Sources & References
- 1
Mailforge Official Pricing(2026)
- 2
PrimeForge Official Pricing(2026)
- 3
InboxKit Pricing(2026)
Ready to set up your infrastructure?
Plans from $39/mo with 10 mailboxes included. Automated DNS, warmup, and InfraGuard monitoring included.