Are you ready to warm up?

Three things gate readiness: you must send from a dedicated subdomain (never your root/brand domain) so cold or scaled outbound can't poison your primary mail; you need a valid, non-permissive SPF record with no PermError; and you need a DMARC record published (p=none is fine to start). DKIM must also be signing on your sending selector — confirm that with your ESP. Once those pass, you can start ramping.

Cold and scaled outbound carries reputation risk — bounces, complaints, and spam-trap hits. If you send it from your root domain, a bad run damages the deliverability of every email your company sends, including transactional and one-to-one mail. A dedicated sending subdomain isolates that risk while still aligning to your brand for DMARC.

Start low and ease up. This tool generates a week-by-week schedule that begins at roughly 20-50 messages a day — lower for a brand-new domain, higher for an established one — and increases gradually, slowing its growth as it approaches your target so there's no abrupt jump into full volume. Send to engaged recipients first and watch your bounce and spam-complaint rates at every step. It's a sane starting schedule, not a guarantee — slow down if your numbers degrade.

Because one mailbox can only send so much before its reputation suffers. A safe steady state is roughly 35 emails a day per mailbox, so reaching a few thousand sends a day means spreading volume across many warmed mailboxes rather than pushing one harder. Provider limits make this firmer: a Google Workspace account caps at about 2,000 external recipients a day and Microsoft 365 at about 10,000 — so scaling outbound is mostly a question of how many mailboxes you warm, not how hard you push each one. The tool estimates the number from your target volume and flags your provider's ceiling when it can detect it from your SPF record.

Watch two numbers as you ramp: if your bounce rate climbs above about 5%, or your spam-complaint rate above about 0.1%, hold your volume flat for a week before increasing again — those are the thresholds mailbox providers act on. It also helps to spread your daily volume across recipient providers (Gmail, Outlook, Yahoo) rather than hammering one, keeping to roughly 1,000 a day per provider once warmed.

Yes. A freshly registered domain has zero sending reputation, so mailbox providers throttle it aggressively. If your domain is under ~90 days old, start at a lower daily volume and stretch the ramp out longer before scaling. This tool detects the domain's age and lowers the starting volume and lengthens the schedule automatically.

Yes, fully read-only. It inspects public DNS (SPF, DKIM, DMARC, MX) and your domain's registration date, then tells you whether you're ready, drafts a ramp schedule, and estimates how many mailboxes you'll need. It never changes your DNS, never sends mail, and needs no credentials.