Write the email. See where it lands.

Your draft appears in a real-looking inbox. Add spammy words and watch it move to the spam folder.

  • No signup needed
  • No payment required
  • Nothing stored, runs in your browser
  • Flagged words highlighted as you type
New message Draft saved
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Subject
0 words
Lands in Inboxrisk 0/100
Inbox 4
Spam 1
SPAM

      All the free tools

      Each one answers a question people ask right before a campaign goes wrong.

      Spam word checker

      Paste a draft and see whether it lands in the inbox or in spam, with every risky phrase highlighted.Open tool

      Subject line grader

      Grade a subject line and see it inside a phone inbox, truncated exactly where phones truncate it.Open tool

      Sending volume planner

      Turn a daily volume into inboxes, domains, warmup ramp and monthly cost. Click any domain to see its inboxes.Open tool

      Domain check

      Live SPF, DKIM, DMARC and MX lookup with raw records and plain-English fixes.Open tool

      Cold email ROI calculator

      Turn send volume and reply rates into meetings, deals, revenue and cost per meeting.Open tool

      Sending domain name generator

      Generate brand-matching names for cold email sending domains.Open tool

      Guides

      Short, specific, written from running cold email infrastructure.

      SPF “too many DNS lookups”: why it breaks and the fix that holds

      SPF allows 10 DNS lookups. Past that, receivers ignore your record entirely. Here is how lookups are counted and the fix that does not rot.Read

      Gmail, Yahoo and Outlook sender rules, explained for cold emailers

      What the bulk sender requirements actually demand, what happens at 5,000 messages a day, and the two numbers that decide whether you get filtered.Read

      How many inboxes per domain is safe for cold email in 2026

      Three inboxes per domain, 40 emails per inbox per day, on domains older than 30 days. Where those numbers come from and when you can break them.Read

      How long to warm up a cold email domain, and when to stop

      Two to three weeks before full cold volume, then keep warmup running at a lower rate. What warmup actually does and the signs it is finished.Read

      Which DMARC policy should a cold email domain use?

      Start at p=none with reports, then move to quarantine and reject once aligned mail is passing. What each policy does and the record to paste.Read

      DKIM selector not found: how to find yours and check it

      A checker says no DKIM when you know it is set up. The key lives under a selector only your provider knows. Here is where to find it for Google, Microsoft and the common sending tools.Read

      All guides

      Questions

      Does a spam word checker guarantee inbox placement?

      No. Content is one of three signals. Domain reputation and sending behaviour matter more once your copy is clean. Use the checker to remove avoidable triggers, then check your domain setup.

      Is my email stored?

      No. The checker runs entirely in your browser. The text never reaches our server.

      What is a good spam score for cold email?

      Under 25 on this tool. Between 25 and 44 is borderline and depends on your domain reputation. 45 or more usually goes to spam on a new or cold domain.

      Why is "free" flagged when I see it in newsletters?

      Newsletters go to people who opted in, on warmed domains with high engagement. Cold email has none of that, so filters weigh the same word more heavily.