Cold email spam checker
Paste the subject and body. You get a 0-100 risk score, the words and patterns that send your email to spam or kill the reply, and concrete replacements. Works in English and Polish.
The tool checks two things at once. First, the words and patterns that Gmail and Microsoft filters react to - promises, pressure, money, phishing-style phrasing. Second, what people react to - corporate filler, empty follow-ups, exclamation points and ALL-CAPS words that make the reader delete the email after the first line.
The word lists come from our own campaigns. Every phrase on the list either got flagged by a filter or cut reply rates enough that we dropped it. It is not a generic list copied from the internet.
How the score works
Every hit carries a weight based on how strongly it triggers filters - phishing patterns and time pressure weigh most, money and promotion words weigh medium, filler and risky single words weigh least. On top of that we check structure - subject length, body length, number of links, exclamation points, ALL-CAPS words, fake Re: subjects.
Below 15 the email passes filters and reads like a person. Between 15 and 34, fix the flagged parts before sending at volume. Above 35, do not send the email as written - it damages the domain for every send that follows.
What this tool does not check
Copy is one third of deliverability. The rest is infrastructure and the list. The tool cannot see whether your domain has correct SPF, DKIM and DMARC, whether the mailbox is warmed up, or whether the addresses on the list are verified. Any of those three can send a perfect email to spam.
- Check your DNS setup with our SPF, DKIM and DMARC checker.
- Warm-up and daily limits are covered in the article on managing mailboxes at scale.
The three mistakes we see most often
First, a subject line with a promise. Words like "free," "guaranteed" and "special offer" in a subject line are the shortest route to spam and to a human deleting the email.
Second, a follow-up with nothing new, such as "bumping this," "just checking in" or "circling back." Filters do not punish it, but readers do. Every next email in a sequence has to add a new reason to reply.
Third, length. The first email should be 50-120 words with one question. Anything over 180 words reads like a pitch, and nobody reads pitches in their inbox.
Frequently asked questions
Does a score of 0 guarantee the inbox?
Does it work in Polish?
Do you store my emails?
Why is the full list behind an email?
A new playbook every two weeks for more meetings from prospecting
Strategies from the campaigns we run right now, straight to your inbox.
Unsubscribe in one click.
Albert Zuszman runs Scaling Labs, a B2B prospecting agency based in Warsaw. He has spent years building cold email and cold calling campaigns for B2B companies, PE funds and teams entering the Polish market. He writes about what works in real projects, with campaign numbers.