Questions
What is email warmup?
Warming up means starting with a few emails a day from a new domain, IP address or mailbox and slowly sending more. Mailbox providers judge new senders by how people react, so a sudden jump from zero to thousands looks like spam.
How long does warmup take?
Usually 2 to 6 weeks, depending on how many emails a day you want to reach and how careful you are. The planner shows the exact number of days for your target.
Who should I email during warmup?
Your most engaged contacts first: customers, colleagues and people who recently opened or replied. Replies and opens build trust fastest. Don't use old, bought or scraped lists; bounces and spam complaints undo the warmup.
What if my emails start going to spam?
Pause the increase and stay at the current volume for a few days. Check SPF, DKIM, DMARC and blacklists with our free tools, clean bounced addresses from your list, and keep spam complaints under 0.1%.
Do I need a paid warmup service?
No. Warmup services send automatic emails between their own inboxes to fake engagement, and mailbox providers increasingly detect this. Real emails to real, interested people, ramped up slowly with this plan, work better and cost nothing.
More email tools
- Test an SMTP serverConnect to any mail server, see its TLS certificate and features, check a username and password, and send a test email, with every step explained.
- Check which SMTP ports are openTest all four mail ports of a server at once and see which answer, which are blocked, and what the server says when it picks up.
- MX lookupSee which mail servers receive email for a domain, in priority order, with their IP addresses and a quick health check.
- SPF and DMARC checkerCheck whether your domain's SPF and DMARC records are set up correctly, in plain language, so your email reaches the inbox and nobody can pretend to be you.
- DKIM checkerFind a domain's DKIM public key under the selectors common providers use, or the one you enter, and check its type, length and settings.
- Email blacklist checkCheck an IP address, or a domain with its mail servers and website, against Spamhaus, SpamCop, Barracuda and 13 other spam blocklists at once.