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Warmup is easy to claim. Proof is harder.
Warmproof is designed around the question buyers actually need answered: where do messages land when the people measuring them are not the people warming them?
We do not grade our own homework. Placement is measured on seed mailboxes that share no IPs, domains or reputation with the warmup network.
Placement measured outside the warmup network
Seed mailboxes share no IPs, domains or reputation with the pool
Often measured from own pool
Per-provider placement
Gmail and Microsoft 365 are reported separately
Often blended into one score
Mailbox and relay mode
First-class support for real inboxes and ESPs
Partial or mailbox-only
Maintenance after ramp
Reputation is sustained after the ramp
Often treated as an end state
Mailbox safety cap
Hard 50/day limit by design
High volume marketed as a feature
Audit before warmup
Authentication failures are fixed before sending
Often offered, not enforced
What we optimise for
Slow enough to look human. Independent enough to be useful.
We under-send by design in mailbox mode, keep relay warmup explicit about its different constraints, and give every placement claim a measurement source you can inspect.
Start with the facts