Mailforge Review (2026): Shared IP Mailboxes at Scale

By Saksham JainPublished on: Mar 30, 2026 · 10 min read · Last reviewed: Mar 2026

TL;DR

Mailforge offers the cheapest mailboxes in the market at $2-3/mo, but shared IP infrastructure means 60-68% inbox placement vs 80-85% with real accounts. Here is the full review with real numbers.

What Mailforge Does

Mailforge provisions email mailboxes on shared IP infrastructure at $2-3/month. It is the cheapest option in the cold email infrastructure market. Setup is fast. accounts are ready in minutes.

Critical distinction: Mailforge does not provision real Google Workspace or Microsoft 365 accounts. It creates accounts on shared sending infrastructure where multiple customers share the same IP addresses.

Deliverability Reality

Mailforge: 63% average inbox placement, 23% spam rate, high variability (54-72%)
InboxKit (real Google): 82% average inbox placement, 8% spam rate, low variability

The 19-point gap is caused by shared IP reputation. When other users on your shared IP send poorly, your deliverability drops even with perfect infrastructure and copy.

Pricing

Base price: $2-3/mailbox/month (shared IP infrastructure, not real Google/Microsoft)

Warmup: Requires Warmforge (separate subscription)
Monitoring: Requires Infraforge (separate subscription)
SSL: ~$0.50/domain/mo extra
Domain masking: ~$1/domain/mo extra

Mailforge alone is incomplete for production use. With Warmforge and Infraforge subscriptions, effective cost climbs well above the headline price. InboxKit plans start at $39/mo for 10 mailboxes (from $2.99/mailbox on Enterprise) with real Google + Microsoft accounts, warmup available at $3/mailbox/mo (add-on), InfraGuard monitoring, and inbox testing.

What Mailforge Does Well

Fastest provisioning in the market. accounts ready in minutes. Lowest base price at $2/mailbox/month (annual). Easy to scale. adding accounts is instant. No platform fee. pay only for mailboxes.

What Fails at Scale

Shared IP reputation risk. Other users' behavior directly affects your deliverability. You have no control over who shares your IP.
No warmup included. Requires a separate Warmforge subscription.
No monitoring included. Requires a separate Infraforge subscription.
Header fingerprinting. Sophisticated email filters can identify shared infrastructure even with domain masking.
Higher replacement rate. Accounts on contaminated IPs may need replacement more frequently than real Google/Microsoft accounts.

Verdict

Mailforge has a legitimate use case: cheap, disposable mailboxes for testing campaigns or short-term sends where deliverability is less critical.

For production cold email at scale, the shared IP risks and the need for separate warmup and monitoring subscriptions make the total cost and complexity higher than they appear. Real Google/Microsoft accounts deliver more consistent results.

Rating: 5.5/10

InboxKit plans start at $39/mo for 10 mailboxes (from $2.99/mailbox on Enterprise) with real Google + Microsoft accounts, warmup available at $3/mailbox/mo, InfraGuard monitoring, and inbox testing. competitive pricing with significantly better infrastructure.

Frequently Asked Questions

No. Mailforge uses shared IP infrastructure, not real Google Workspace or Microsoft 365 accounts. Deliverability is lower and depends on other users.

Base price yes ($2-3 vs InboxKit plans from $39/mo). Real cost no. Adding warmup and monitoring pushes Mailforge to $6-8.50/mailbox. InboxKit Enterprise at $2.99/additional mailbox plus $3/mailbox/mo for warmup (add-on) still costs less with real Google + Microsoft accounts and InfraGuard monitoring included.

Shared IP means other users on the same IP address affect your sending reputation. If another user sends spam or gets blacklisted, your deliverability drops even with perfect copy and infrastructure. This is why Mailforge averages 60-68% inbox placement vs 82-92% for real Google/Microsoft accounts on InboxKit.

Use Mailforge for short-term testing, disposable campaign experiments, or throwaway accounts where deliverability is not critical. Avoid Mailforge for production cold email campaigns, client outreach, or any use case where inbox placement matters. For production use, InboxKit's real Google Workspace and Microsoft 365 accounts (plans from $39/mo) deliver significantly better results.