How to warm up a new email domain (without landing in spam)

A brand-new sending domain has zero reputation, and mailbox providers (Gmail, Outlook, Apple) treat unknown senders with suspicion. Blast 50,000 emails on day one and you'll teach them your domain is a spam source — a reputation that's slow and painful to repair. Warming up means building trust gradually. Here's how.

First: the DNS that must be in place before you send anything

Warm-up on an unauthenticated domain is wasted effort. Set these up and verify them first:

• SPF — authorises WeZend to send for your domain.
• DKIM — cryptographically signs your mail so it can't be spoofed.
• DMARC — tells providers what to do with mail that fails the above (start at p=none to monitor, tighten later).

WeZend's domain wizard generates the exact records, and the DNS checker validates them live before you rely on them. Don't skip DMARC — Gmail and Yahoo now expect it from bulk senders.

The warm-up schedule

Start small, grow steadily, and let engagement guide the pace. A workable ramp:

• Days 1–3: ~50–100 emails/day, to your most engaged contacts only (recent openers). Early positive signals set the tone.
• Days 4–7: double roughly every other day if complaints stay near zero and opens are healthy.
• Week 2: scale into the low thousands, still favouring engaged segments.
• Weeks 3–4: approach full volume, now including colder contacts in measured batches.

The numbers are a starting point, not a law — let the metrics set the speed. If complaint rate rises or opens dip, hold or step back a day.

Send to people who want it

Warm-up works because engaged recipients generate the positive signals (opens, replies, "not spam") that build reputation. So during warm-up:

• Start with your best segment, not your whole list.
• Suppress known-bad addresses — bounces and old, never-opened contacts drag reputation down.
• Make unsubscribing easy. A visible opt-out beats a spam complaint every time; complaints hurt far more than unsubscribes.

Watch the right signals

Track delivery rate, bounce rate, complaint rate and opens per provider — Gmail and Outlook can behave differently, and a problem at one shows up there first. WeZend's deliverability tooling flags trouble before it hits revenue, so you can slow down before a bad batch sets your reputation back weeks.

Warming up is a two-to-four week investment that protects every email you'll send afterward. Rushing it is the most expensive shortcut in email.

Start free, verify your domain, and begin the ramp.