SMTP infrastructure planning

Estimate SMTP capacity before raising cold email volume.

Plan required daily sends against per-inbox, per-domain, and per-IP capacity assumptions before traffic moves through SMTP infrastructure.

Calculator

Model the send load.

SMTP capacity is a planning signal, not permission to send. Exports should still fail closed when readiness evidence is missing or stale.

Reset defaults

Capacity recommendation

Dedicated SMTP infrastructure

Dedicated server/IP planning for customers that need stronger infrastructure isolation.

Estimated monthly cost

$910.50

Planning estimate only.

Monthly emails

30,000

10,000 prospects x 3 touches.

Daily send requirement

1,385

Spread across 5 send days/week.

Recommended inboxes

56

25 emails/inbox/day cap.

Recommended domains

19

3 inboxes/domain by default.

Infrastructure caps

SMTP IP capacity
3
Domain daily cap
100
IP daily cap
3,000
Warmup assumption
30 days

Per-IP utilization should stay below 80 percent before adding traffic. Scale horizontally with more IPs or domains before raising inbox caps.

Cost assumptions

Dedicated SMTP infrastructure platform planning baseline$249
56 inboxes$336
19 managed domains$28.50
3 SMTP IP capacity units$297

Domain registration, taxes, discounts, support tiers, and real Microsoft/Google reseller SKUs can change the final quote.

Readiness notes

  • Treat this as a planning estimate, not a quote or deliverability guarantee.
  • Readiness gates, seed-placement evidence, and fresh SMTP/IMAP smoke tests still decide exportability.
  • Dedicated SMTP IP capacity should be reserved before raising inbox caps.

Common questions

What does SMTP IP capacity mean here?

It estimates the SMTP-facing IP capacity units implied by the selected package and risk profile. It is not a final network allocation or quote.

Why do provider-backed packages show provider-managed IP capacity?

Microsoft and Google placeholder packages do not model GTM SMTP IP budget because those providers manage their own IP reputation surfaces.

Related workflows

Public proof feed

See how public-safe proof is separated from internal-only evidence.

API quickstart

Use readiness reports before exporting SMTP inboxes to sequencers.

Package capacity calculator

Translate capacity assumptions into a package-level planning estimate.

Inbox readiness checker

Check whether a domain is set up to support the capacity you just planned.

Next step

Turn SMTP capacity into a monthly planning estimate.

Calculate package cost