Domain warmup builds trust for a new sending domain before your first campaign. Mailwarm automates the ramp with real inbox engagement, so new domains reach the inbox instead of the spam folder.
2–4 weeks
before running campaigns on a new domain
A brand-new domain has no sending history, so mailbox providers treat its first emails with suspicion. Two to four weeks of gradual, engaged sending gives them enough history to start trusting it. Brand-new domains sit at the slower end; domains that have sent some email before can ramp faster.
Warming up doesn't end at launch. Keep a maintenance level of warmup running while you send campaigns, so your reputation stays stable when volume picks up.
A typical week-by-week ramp for each inbox on a new domain
| Week | Emails per inbox per day | What to do |
|---|---|---|
| Week 1 | 5–10 | Warmup only, or a few emails to people you know who will reply. |
| Week 2 | 10–20 | Add a handful of personal, one-to-one emails. Keep bounces at zero. |
| Week 3 | 20–35 | Start a small, well-targeted campaign alongside warmup. |
| Week 4 | 35–50 | Scale the campaign gradually if replies are steady and nothing lands in spam. |
| Week 5+ | Up to ~50 | Hold steady per inbox and keep warmup running at a maintenance level. |
Guidance, not a hard rule. Slow down if bounces, spam complaints or spam placement go up. See Gmail sending limits for provider caps.
Builds reputation for a new sending domain, which mailbox providers judge separately from any single inbox.
You need it when: You registered a new domain for outreach, or an existing domain has never sent email at volume.
Builds reputation for an individual inbox through steady, positive engagement.
You need it when: Every new inbox, including new inboxes on an established domain.
Learn about email warmup toolRamps sending volume on a dedicated IP address until providers trust it at full capacity.
You need it when: You send from your own dedicated IP, usually high-volume marketing or transactional email.
Learn about IP warmupA new domain on shared infrastructure needs domain and email warmup. Add IP warmup only if you also send from a dedicated IP.
Warming up an unauthenticated domain wastes the effort. Get these three records right first.
Mailwarm ramps every inbox on your new domain automatically, with engagement from 50,000+ aged real inboxes and live inbox vs spam tracking. Every customer also gets a deliverability audit, a call with an expert and an account manager to make sure the domain is ready before your first campaign.
See inbox vs spam folder placement live, not days later.
Real-time monitoring
Gmail
OutlookEasy to set up and works on autopilot
Book a quick call and you'll get a clear audit of your sending setup + the top 3 fixes to improve inbox placement fast.
Mailwarm supports email warm up for Gmail, Outlook, Yahoo, Zoho, and major email service providers, including SendGrid and other SMTP-based platforms.
Mailwarm team has significantly improved our email deliverability and helped us build a solid foundation for scaling outbound at Luvi. The team is reliable, efficient, and easy to work with. They have become an essential part of our growth stack.
Rhai Goburdhun
Founder & CEO, Luvi
We increased by 31% our Microsoft inbox placement. We tried two warm-up tools before working with Mailwarm. The difference is night and day, these are actual experts, not a dashboard.
William Mann
CEO, Prime Match Recruiting
Using it almost for 2 months, and grow my open rate more than 30%. Must have for everyone, who runs Cold outbound campaigns.
Max Markarenko
Founder & CEO, Docsify.net
I ran a deliverability test on the domain you guys are warming up and the results are looking brilliant! Big fan of you guys' service :)
Austin Monson
Growth Strategy, AskWonder.com
So far deliverability to Office365/exchange has improved for the mailbox we're testing with Mailwarm.
Anton van Rhyn
Founder, Wavo.co
Stop losing opportunities to spam folders. Boost your sender reputation and watch your outreach thrive.
