Connect and pass pre-flight
We check SPF, DKIM, DMARC and MX before a single warmup message moves. A domain that cannot authenticate is fixed first, not warmed toward a result it cannot reach.
How it works
Reputation grows from believable behaviour.
Warmproof treats warmup as a controlled, measured process: authenticate first, build carefully, measure independently, then adjust with evidence.
Build reputation carefully
Persona-consistent correspondence is sent at realistic times, opened, read and answered with natural latency. Mailbox mode never exceeds 50 interactions a day per mailbox.
Prove it from outside
Independent seed mailboxes record where mail lands by provider: Primary, Promotions, Spam or missing. The people warming your domain never grade their own work.
Adapt tomorrow from today
The ramp reads measured placement and adjusts volume gently. It advances when results hold and backs off when they slip.
Choose the right model
Two paths, one measurement standard.
Mailbox mode
You have a real inbox.
Connect IMAP + SMTP with OAuth or an app password. Warmproof can send, detect, reply and engage on both sides of realistic correspondence.
- Reputation: domain + mailbox + provider account
- Engagement: both sides
- Safety: maximum 50 interactions a day per mailbox
Relay mode
You send through an ESP.
Connect Amazon SES, SendGrid, Mailgun, Brevo, Postmark or raw SMTP. There is no customer inbox to read or simulate.
- Reputation: domain + dedicated sending IP
- Engagement: pool side only
- Volume: relay mode follows your declared sending volume
Long-term reputation
Warmup does not end. It settles.
- RampingCareful increases from a cold start.
- StabilisingPlacement holds while the signal confirms.
- MaintenanceLow-volume behaviour preserves reputation.
- RegressionMeasured slips return to controlled ramping.
Start with the facts