How to Warm Up a New Email Domain (Day-by-Day Schedule)

Why new domains are treated with suspicion

Providers like Gmail and Outlook score domains on their history: how long they have sent, at what volume, how consistently, and how recipients reacted. A domain registered days ago has none of that, and domain age itself is a signal some filters use.

Reputation is tracked for both the domain and the sending IP. On a shared mail service the IP already has history, so your job is mainly to build domain reputation. That is good news — but it also means the domain’s first impression is entirely yours to make.

Before you send anything: authentication

• Publish MX records so the domain can receive replies — a domain that cannot receive mail looks disposable.
• Publish one SPF record covering your mail provider.
• Enable DKIM signing and publish the public key at the selector your provider gives you.
• Publish DMARC, starting with v=DMARC1; p=none; rua=mailto:you@yourdomain.com.
• Put a real website on the domain, even a single page, with contact details. Some filters and many recipients check.
• Verify everything with a DNS checker. Sending before authentication is in place wastes the first impression you are trying to build.

A practical ramp schedule

These numbers are for total outbound messages per day from the new domain, across all mailboxes, and assume mostly one-to-one business mail. Move to the next stage only if bounces stay under 2% and nothing is landing in spam in your test accounts:

• Days 1–3: 10–20 messages a day, to colleagues, partners and existing customers who know you.
• Days 4–7: 20–40 a day. Encourage replies — ask a question, confirm a meeting.
• Week 2: 40–75 a day. Begin normal outreach to contacts who expect to hear from you.
• Week 3: 75–150 a day, spread across the working day rather than in one burst.
• Week 4: 150–300 a day if your metrics are clean.
• Week 5 onward: increase by no more than 20–30% a week toward your normal volume.
• If you see a spike in bounces, spam placement or 421 deferrals, drop back to the previous level for several days before trying again.

Engagement is the real warm-up

Volume is only half the picture. What builds reputation is recipients opening, replying, moving your mail out of spam and adding you to contacts. A reply from a real person is one of the strongest positive signals there is.

In the first weeks, prioritise conversations over announcements. Send to people you have corresponded with before, write messages that invite a reply, and use plain text or light formatting. Ask a few trusted contacts at Gmail, Outlook and Yahoo to check spam and mark your message as not spam if needed.

Automated "warm-up networks" that exchange fake opens and replies between thousands of inboxes are a gamble: providers have learned to recognise the patterns, and most mailbox providers’ terms prohibit them. Real engagement from real contacts is slower but durable.

What not to do with a new domain

• Do not import a list of old or purchased contacts and send to all of them on day one. High bounce and complaint rates on a fresh domain can get it filtered for weeks.
• Do not run cold outreach at scale from your primary business domain. If you must do cold email, use a separate domain so your main domain’s reputation is protected.
• Do not send newsletters or marketing blasts from your everyday mailbox service. Use a dedicated email service provider designed for bulk mail, with proper unsubscribe handling and a sending subdomain.
• Do not switch link-tracking or URL shorteners on early; links to unknown tracking domains add risk.
• Do not go silent and then burst. Consistency matters more than raw volume.

Monitoring progress

Track hard bounces (remove those addresses immediately), spam placement in a few seed accounts at different providers, and any 4xx deferrals in bounce messages. Once you are sending a few hundred messages a day to Gmail, register the domain in Google Postmaster Tools for a direct view of spam rate and authentication.

A note on tools: HavitoMail is built for everyday business email — mailboxes, aliases and IMAP/SMTP on your own domain — and applies per-message and daily recipient limits to protect shared sending reputation. That suits a normal warm-up of one-to-one mail well, but it is not a bulk or newsletter platform; for marketing campaigns, use a dedicated ESP on a subdomain.