Instantly readiness planning
Plan SMTP inbox capacity before sending accounts into Instantly.
Use conservative caps to estimate how many inboxes and domains need to be ready before Instantly campaign setup.
Calculator
Model the send load.
The calculator supports pre-export planning. It does not replace provider-specific checks, seed placement, or GTM launch-gate approval.
Capacity recommendation
Shared SMTP control plane
Lowest-friction package for readiness-gated SMTP inboxes on managed shared capacity.
Estimated monthly cost
$226
Planning estimate only.
Monthly emails
15,000
5,000 prospects x 3 touches.
Daily send requirement
693
Spread across 5 send days/week.
Recommended inboxes
28
25 emails/inbox/day cap.
Recommended domains
10
3 inboxes/domain by default.
Infrastructure caps
- SMTP IP capacity
- 2
- 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
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.
- GTM-managed shared SMTP capacity; IP count is a planning signal, not a line item.
Common questions
Is this an Instantly deliverability guarantee?
No. It only estimates infrastructure capacity. Deliverability and placement still depend on reputation, content, targeting, authentication, and launch controls.
Why plan capacity before adding inboxes to Instantly?
Capacity planning helps avoid overloading too few inboxes or domains and gives operators a clear readiness checklist before campaign activation.
Related workflows
Email spam checker
Review subject and body copy for common spam-trigger patterns.
DNS & auth checker
Confirm authentication records before inboxes are used.
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
Use GTM readiness reports before sequencer export.
Read the readiness workflow