Sender reputation & warm-up
Is your domain warm-up ready — or should you ramp more slowly?
Paste any sending domain and we'll resolve its SPF / DKIM / DMARC / MX posture over DNS and ask an AI deliverability analyst for a 0-100 warm-up health score plus 3-5 plain-English findings covering volume ramp, sending-frequency issues, and risk flags. No signup required.
The four pillars the score is anchored on — SPF presence, DKIM default-selector signing, DMARC enforcement level, and MX with a backup — are the same ones the major mailbox providers consult on every inbound message. A domain missing two or more pillars pulls the score up sharply toward "warm-up before sending"; a clean auth footprint with a backup MX pushes it into "ready for sending".
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Email warm-up checker — frequently asked questions
Start from the pillar guide
New to warm-up? Read the full pillar guide first.
The /resources/email-warm-up pillar walks through why warm-up matters for a new or re-activated sender, what the per-week target table looks like for a 1k/day ramp, and the SPF / DKIM / DMARC / list-hygiene checkpoints that should be in place before each ramp step. Pair the guide (for what a healthy ramp looks like) with the checker above (for where your domain sits today) for one round-trip before each ramp step.
Read the warm-up pillar guide →Pair this with the schedule guide
Want the step-by-step week-by-week schedule?
The Email Warm-Up Schedule guide walks through what a healthy week 1 looks like for a 1k/day target, when it is safe to grow 1.5x, when it is safe to grow 2x, and the SPF / DKIM / DMARC / list-hygiene checkpoints that should be in place before each ramp step. Pair the guide (for "what week 1 / week 4 / week 8 should look like") with the checker above (for "does the domain I'm ramping have the auth posture to support the ramp I have in mind") and you have one round-trip before each ramp step.
Read the warm-up schedule guide →Pair this checker with the guide
Want the bigger picture on sender reputation?
A clean authentication footprint is the first, but not the only, signal the mailbox providers consult. The full reputation guide explains how this warm-up health score fits into the broader reputation composite — Postmaster domain reputation, SNDS filter colour, complaint rate, and the blocklists your new IP is on day one.
Read the sender reputation guide →