SendScale LogoSendScale

Free Email Spam Checker

Paste your subject line and email body to get an instant spam score with plain-language tips on what to fix before you hit send.

What is an email spam checker?

An email spam checker analyses your subject line and email body for patterns that spam filters commonly flag, such as all-caps text, excessive exclamation marks, high-risk phrases, and too many links. It returns a spam score and tells you exactly what to fix before you send.

Even well-intentioned emails can land in the spam folder if they contain phrases that look promotional or deceptive to automated filters. Checking your content first is one of the simplest ways to improve deliverability.

What triggers spam filters?

Spam filters use hundreds of signals to score incoming mail. Content-based triggers are some of the most avoidable:

  • Spam trigger words: phrases like “FREE!!!”, “GUARANTEED”, “ACT NOW”, “CLICK HERE”, and “LIMITED TIME OFFER” are classic signals that filters learn to catch.
  • Excessive punctuation: multiple exclamation marks (!!!), question marks (???), or dollar signs ($$$) raise scores quickly.
  • ALL CAPS: writing in all-uppercase reads as shouting to both filters and humans.
  • Too many links: more than two or three URLs in a single email (especially to unfamiliar domains) raises risk scores.
  • Misleading subject lines: fake reply threads (“Re: Re: your request”) or vague teasers designed to trick a click are flagged heavily.

Fixing these in your draft takes minutes and can meaningfully improve where your email lands.

Why checking before sending matters

When an email lands in spam, the damage compounds. Low open rates signal to mailbox providers that your mail is unwanted, which worsens your sender reputation and makes future emails even more likely to be filtered. For cold outreach, newsletters, and promotional campaigns, this cycle can significantly reduce your reach.

Running a spam check takes seconds and costs nothing. It is one of the easiest steps you can take to protect deliverability, alongside proper email authentication and inbox warm-up.

Content is only part of the picture

Spam filters also weigh sender reputation, email authentication (SPF, DKIM, DMARC), and how recipients have engaged with your previous mail. Clean content with broken authentication can still end up in spam.

Use this spam checker alongside our Email Domain Checker to verify your SPF, DKIM, and DMARC records. Both tools are free and require no account.

A spam score is a numerical rating that estimates how likely your email is to be caught by spam filters before it reaches the inbox. Higher scores mean more spam-like signals were found in your subject line or body. Most filters use a combination of content analysis, sender reputation, and authentication checks. This tool focuses on content and subject line patterns.