InboxKit vs Mailforge: Real Google/Microsoft Accounts vs Shared IP Infrastructure

InboxKit provisions real Google Workspace and Microsoft 365 accounts. Your emails are sent from genuine Google/Microsoft servers with individual authentication and reputation.

Mailforge uses shared IP infrastructure. It does not create real Google Workspace or Microsoft 365 accounts. Multiple customers share the same sending IPs, and your deliverability is partially dependent on other users' behavior.

This is the most important distinction. Real accounts have individual reputation and authentic headers. Shared IP mailboxes pool reputation across all users on the same IP.

Feature	InboxKit	Mailforge
Account Type	Real Google/Microsoft	Shared IP (not real accounts)
Plans	From $39/mo (10 incl., from $2.99 additional)	Not available
Microsoft 365	$2.99/mo	$2-3/mo (shared IP, not real M365)
Warmup	$3.00/mailbox/mo (isolated)	None (Warmforge $2/mo separate)
Monitoring	InfraGuard (per-domain)	None (Infraforge $1.50/mo separate)
Platform Fee	$0	$0

True cost comparison (50 mailboxes with warmup and monitoring):

Cost Item	InboxKit (Google)	Mailforge
Mailboxes	$2.99 x 50 = $149.50	$3.00 x 50 = $150.00
Warmup	$3.00 x 50 = $150.00	Warmforge: $2.00 x 50 = $100.00
Monitoring	InfraGuard (per-domain)	Infraforge: $1.50 x 50 = $75.00
Total	$299.50 + InfraGuard	$325.00

Mailforge's base price is slightly lower, but InboxKit provides real Google/Microsoft accounts with significantly better deliverability. Once you add warmup and monitoring from separate Forge products, the total costs are comparable.

60-day test with identical campaigns, lists, and copy:

Metric	InboxKit	Mailforge
Avg Inbox Placement	82%	63%
Spam Rate	8%	23%
Variability	Low	High (54-72% range)

• InboxKit: 4,000 x 82% = 3,280 inbox deliveries/day
• Mailforge: 4,000 x 63% = 2,520 inbox deliveries/day
• Difference: 760 more emails reaching inboxes per day, or 22,800 additional inbox deliveries per month

• Testing messaging before investing in production infrastructure
• Short-term campaigns where long-term reputation does not matter
• Disposable accounts for high-risk outreach
• Budget-constrained startups validating product-market fit

For production cold email at scale, real accounts are the better investment.

A comprehensive breakdown of every capability that matters for cold email infrastructure:

Feature	InboxKit	Mailforge
Mailbox Type	Real Google Workspace and Microsoft 365 accounts	Shared IP mailboxes (not real Google/Microsoft)
Google Workspace	$2.99/mo per mailbox	Not available
Microsoft 365	$2.99/mo per mailbox	$2-3/mo (shared IP, not real M365)
Warmup	Isolated network, $3.00/mailbox/mo	None built-in (Warmforge $2/mo, separate product)
Warmup Method	Controlled isolated pool, 92% avg inbox rate	Shared pool via Warmforge, ~83% avg inbox rate
Monitoring	InfraGuard: DNS, blacklist, reputation per domain	None built-in (Infraforge $1.50/mo, separate product)
Inbox Placement Testing	Built-in, included at no extra cost	Not available
DNS Automation	Auto-configure SPF, DKIM, DMARC on purchase	Manual DNS setup required
Sequencer Integrations	One-click export to Instantly, SmartLead, SendKit	Manual SMTP/IMAP credential setup
IP Type	Google/Microsoft US-based IPs (highest reputation)	Shared IPs across all Mailforge customers
Account Isolation	Each mailbox has individual reputation	Reputation pooled across shared IP users
Dashboard	Unified: mailboxes, domains, warmup, health, analytics	Mailboxes only (monitoring and warmup are separate products)
Support	Live chat, onboarding assistance	Email support
Bulk Provisioning	Yes, CSV upload for domains and mailboxes	Yes, bulk creation available
API Access	REST API for mailbox and domain management	API available

Switching from Mailforge to InboxKit takes 2-3 weeks: 1. Sign up for InboxKit and create mailboxes (plans from $39/mo) 2. Let isolated warmup build reputation (14-21 days) 3. Run inbox placement tests to verify 4. Update sequencer credentials 5. Cancel Mailforge

Run both in parallel during warmup for zero campaign downtime.