Infraforge Pricing: The Line-Item Math of Dedicated-IP SMTP
Infraforge prices every isolation component on its own line — the mailbox, the dedicated IP, the SSL certificate, the domain masking. Here's how the bill actually assembles across volume tiers.
Bottom line
Infraforge runs the most unbundled pricing model in this category. The per-mailbox SMTP rate — between $3 and $4 depending on volume — is one line item. The dedicated IP is its own $99 monthly fee.
SSL and domain masking is metered per domain at $2 each. API access and the masterbox come bundled into the per-mailbox rate, along with multi-IP provisioning and pre-warmed domains. What you end up with is a pricing surface built around one base unit and three add-on dials, which is unusual at this price point.
Most competitors pick either flat-per-mailbox or contract-based pricing; Infraforge goes line-item instead, giving compliance-minded teams the granular control to spell out exactly what isolation looks like at their volume. That same line-item structure, though, makes the bill genuinely harder to predict for buyers who haven't already mapped out their domain count.
How Sendbox compares
Sendbox plans start at $99/mo with dedicated IPs and the full deliverability suite included on every tier — no add-ons required.
Infraforge Plans
| Plan | Price | What you get | Watch out for |
|---|---|---|---|
| SMTP Mailbox rate varies depending on volume bracket | $3-$4/mailbox/mo |
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| Dedicated IP Block a flat monthly fee per IP block | $99/mo |
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| SSL + Domain Masking billed per domain, per month | $2/domain/mo |
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What Infraforge actually costs at typical fleet sizes
| Usage scenario | Monthly cost | Notes |
|---|---|---|
| 25 mailboxes, 5 domains | ~$197/mo | 25 mailboxes at $3.50 each, plus the $99 IP fee, plus 5 domains at $2 for masking. Once the fixed IP fee is factored in, that's an effective $7.88 per mailbox — exactly why small fleets feel expensive here. |
| 50 mailboxes, 10 domains | ~$294/mo | 50 mailboxes at $3.50 each, plus the $99 IP fee, plus 10 domains at $2 for masking. The effective per-mailbox cost drops to $5.88 as the IP fee spreads across more mailboxes. |
| 100 mailboxes, 20 domains | ~$489/mo | 100 mailboxes at $3.50 each, plus the $99 IP fee, plus 20 domains at $2 for masking. Per-mailbox cost stabilizes around $4.89 — roughly the size where Infraforge's line-item pricing starts becoming genuinely competitive. |
| 200 mailboxes, 40 domains | ~$879/mo | 200 mailboxes at $3.50 each, plus the $99 IP fee, plus 40 domains at $2 for masking. Per-mailbox cost falls to $4.40. The volume bracket may also drop the base rate to $3 at this scale — confirm with sales. |
| Agency with 3 client IP isolations | ~$687/mo for 100 mailboxes | 100 mailboxes at $3.50 each, plus three IP blocks at $99 each, plus 20 domains at $2 for masking. Three separate IP blocks for client reputation isolation push the bill roughly 40 percent above the single-IP equivalent. |
How the four-line-item pricing actually assembles
Infraforge's bill is a sum of four components: mailboxes ($3-$4 each), dedicated IP blocks ($99 each), SSL/masking ($2 per domain), and optional add-ons for multi-IP allocation. The structure rewards teams who understand exactly what they need at each level. Mailboxes scale linearly with your sending fleet.
IP blocks scale with how granular your reputation isolation needs to be (one block covers everything; multiple blocks separate client books or campaign cohorts). Domain SSL scales with how many sending domains you operate, which is typically 1 domain per 5 to 10 mailboxes for reputation diversification. The most common bill mistake is provisioning more domains than you need because the $2/domain fee feels small.
At 50 domains, that line alone is $100/mo, equal to a full IP block.
Key takeaways
- Mailboxes scale with fleet size, $3-$4 each
- IP blocks scale with isolation granularity, $99 each
- SSL/masking scales with domain count, $2 each
- Multi-IP provisioning is bundled into the IP block, not separate
Where the Infraforge bill breaks predictably
Three patterns where the bill diverges from a buyer's initial estimate: First, at small fleets (under 25 mailboxes), the $99 IP fee dominates the bill. Effective per-mailbox cost is two to three times the headline rate because the fixed fee amortizes over too few mailboxes. Teams in this band often complain about price; the fix is either scaling up or accepting that small SMTP fleets are not the target market.
Second, at multi-client agencies, the IP block multiplication can surprise. Three separate client reputations need three IP blocks = $297/mo just for IPs. The agency model on Infraforge is more expensive than the in-house model at equivalent mailbox count.
Third, at heavy-domain-rotation fleets, the masking fee compounds. Teams that rotate domains aggressively for cold email safety (a common pattern with anti-spam measures) can have 40+ domains, pushing masking past $80/mo.
Key takeaways
- Small fleets pay 2-3x effective per-mailbox cost
- Multi-client agencies pay per-client IP block stacks
- High-domain-rotation fleets pay heavy masking fees
- Mid-size fleets at 50-150 mailboxes hit the sweet spot
How Infraforge fits in the Salesforge ecosystem
Infraforge is the dedicated-IP tier of the Salesforge infrastructure stack. Mailforge is the shared-IP sibling at $2-$3 per mailbox. Buyers in the Salesforge ecosystem treat the two as the same product with different isolation guarantees, not as separate vendors.
The practical implication for pricing: if you start on Mailforge and grow into Infraforge, the migration is in-account (same login, same masterbox, same DNS setup). You do not re-onboard. The Mailforge-to-Infraforge upgrade is essentially adding the $99 IP block fee and moving mailboxes to the dedicated-IP fabric.
The Salesforge ecosystem assumption matters because it shapes who Infraforge is sized for. The pricing is aggressive for teams already invested in Salesforge sequences. It is less competitive for teams shopping cold and comparing across vendor families.
Key takeaways
- Infraforge is the dedicated-IP tier of the Salesforge stack
- Mailforge to Infraforge is an in-account upgrade, not a migration
- Pricing assumes you are already in the Salesforge ecosystem
- Cold buyers comparing across vendors see less of the advantage
Why compliance-led teams prefer the line-item structure
For most cold email buyers, flat per-mailbox pricing is easier to budget. Compliance-led buyers (regulated industries, financial services, healthcare-adjacent SaaS) often prefer line-item structures because they can audit exactly what isolation is included at what cost. The line items on Infraforge map cleanly to compliance requirements: dedicated IP (one tenant per IP for SPF auditability), SSL per domain (TLS auditability), multi-IP provisioning (cross-client isolation for B2B2B agencies), per-mailbox pre-warming (reputation history auditability).
The trade-off is that compliance buyers also pay more per unit because they need every component. Cost-conscious buyers usually find the same isolation level cheaper inside a bundled product like InboxKit. Choose by which side of the compliance/cost axis you operate from.
Key takeaways
- Line items map to compliance audit requirements
- Dedicated IP, SSL, masking, and warmup history are each verifiable
- Compliance buyers pay more but get auditable isolation
- Cost-conscious buyers prefer bundled-IP alternatives
Keep reading
Got questions? We've got answers.
Still stuck? Talk to us →Roughly $489/mo at typical configuration: 100 mailboxes at $3.50 each = $350, plus $99 for the dedicated IP block, plus $40 for SSL/masking on 20 domains. Per-mailbox effective cost is $4.89. The exact rate depends on your volume bracket; confirm with sales before sizing your bill.
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