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New domain warm up that makes cold email land.

A fresh domain has zero sender reputation, and filters treat zero as guilty. MailStrike builds that reputation before your first campaign, not after it fails.

Book a Call →How warming works
MailStrike dashboard showing a new domain climbing to outreach-ready reputation

Warm-up progress

Day 21 / 21

Ready for outreach

The risk of starting cold

A brand-new domain has no reputation to spend.

Send real campaigns on day one and filters have nothing to go on. Early mail lands in spam, recipients never see it, engagement stays at zero, and the domain gets flagged within days.

From zero

How MailStrike warms a new domain.

Filters trust senders with a track record, and a new domain has none. MailStrike builds one from day one, with real engagement that climbs week over week until your score clears for outreach.

Real domains, real threads

Your fresh domain trades genuine back-and-forth email with a network of real, established domains, not the recycled throwaway inboxes cheap warmup tools pass mail between.

Established domainsTwo-way threads

Engages like a real human

Every exchange behaves the way people actually use email, down to the small tells filters quietly watch for in a brand-new sender.

Natural read timeWritten from your businessAI-written, never templated

Ramps from zero to ready

Volume starts low and climbs on the schedule providers expect from a legitimate new sender, building a clean record day by day until your score clears for outreach.

Provider-tuned rampClean record from day oneReady in 21 days

Together, these signals build the reputation a new domain has to earn before Google and Microsoft will trust it with the inbox.

See how the personas work
Day by day

The 21-day warmup, start to ready.

1

Day 0

Connect and verify

OAuth your Google Workspace or Microsoft 365 mailbox (or any SMTP provider). MailStrike checks SPF, DKIM, DMARC, and MX automatically and flags anything that would hurt deliverability before a single email goes out.

2

Week 1

Low-volume persona engagement

AI personas begin exchanging real mail with your domain at the volume providers expect from a legitimate new sender. Opens, replies, and important-marks start building the behavioural record filters score you on.

3

Week 2

The ramp

Volume climbs automatically on a schedule tuned to your provider. Deliverability improves noticeably around this point, and any mail that lands in spam is found and rescued, teaching filters they made a mistake.

4

Day 21

Ready for outreach

Score above 90, three weeks of clean engagement, domain age verified. The dashboard flips to Ready for outreach. Start your first campaign at low volume while warming continues in the background.

Every thread the personas exchange is written fresh by the LLM, grounded in your industry and company description. Nothing templated, nothing for filters to fingerprint. See how the personas work.

Before you start

Check your foundations first.

Email Auth Checker

Audit SPF, DKIM, DMARC, and MX before warmup starts. Free, no signup.

Getting started with email warming

What your first week of warmup looks like, step by step.

Does email warming work?

The honest answer, with the mechanics behind it.

Frequently asked

New domain warmup questions.

How long does it take to warm up a new domain?
21 days on a standard ramp. By around the two-week mark deliverability improves noticeably, and a clean account reaches a stable Inbox Reputation Score above 90 by day 21. MailStrike's dashboard shows a Ready for outreach status once your score, warmup time, and domain age all clear their thresholds.
Can I send cold email while my domain is still warming?
Wait until the Ready for outreach signal, then start at low volume (20 to 30 sends a day) and scale gradually. Sending real campaigns from a domain with no reputation is the fastest way to get flagged, and a flagged domain takes far longer to repair than it takes to warm one properly.
What daily volume should a new domain start with?
MailStrike starts warming volume low and ramps it automatically over roughly four weeks, following the pattern providers expect from a legitimate new sender. After warmup, begin real outreach at 20 to 30 sends per mailbox per day and increase week over week while background warming continues.
Should I use a separate domain for cold outreach?
Yes, most teams should. A dedicated outreach domain (for example a .com variant of your brand) protects your main domain's reputation if a campaign goes wrong. Warm the new domain from day one, keep SPF, DKIM, and DMARC clean, and your primary domain stays insulated.
What happens if I skip warmup on a new domain?
Filters score senders on behaviour, and a brand-new domain has none. Early campaigns land in spam, recipients never see them, engagement stays at zero, and the domain gets flagged within days. That label is sticky: repairing a burned domain takes weeks longer than warming a fresh one.
Get started

Your domain could be ready in three weeks.

Connect a mailbox, set your profile, and let the warmup run.

Book a Call →