IGSendMail

Free Email Spam Checker

Paste a subject line and email body into this email spam checker to instantly scan for spam trigger words, ALL-CAPS, risky punctuation, link overload, and missing CAN-SPAM elements. You get a 0–100 spam score, a verdict, and a one-line fix for every issue — all in your browser, with nothing uploaded. Think of it as a quick, free spam test for your copy before you hit send.

What triggers spam filters

Mailbox providers score every message before it reaches the inbox. Content is only part of that score, but it's the part you control instantly. This spam checker helps you catch those content signals in seconds; sender reputation and authentication — covered below — decide the rest.

Spam trigger words

We scan against ~120 known spam words and phrases grouped into money, free/discount, urgency, medical, scam/phishing, and overpromise. Each hit is weighted by category and counted in the subject and body, where subject-line hits cost more.

Formatting signals

ALL-CAPS ratio, excessive exclamation marks, "$$$" and punctuation runs, and vague "click here" CTAs all read as shouting or low-effort spam to filters.

Links & images

We measure link count, text-to-link ratio, image-to-text balance, and flag URL shorteners (bit.ly, tinyurl, t.co), which hide destinations and are heavily abused by spammers.

CAN-SPAM basics

Commercial email must include a working unsubscribe mechanism and a valid physical mailing address. We check for both — missing either is a legal problem and a spam signal.

CAN-SPAM in one minute

The U.S. CAN-SPAM Act applies to commercial email. The practical rules: don't use deceptive subject lines or "from" addresses, identify the message as an ad where relevant, include your valid physical postal address, give a clear opt-out, and honor unsubscribe requests promptly (within 10 business days). Penalties run into the tens of thousands of dollars per email, so the unsubscribe link and physical address aren't optional — and filters know to look for them.

How to improve your spam score

  • Write the subject like a human. No ALL-CAPS, no "!!!", no "$$$", and skip the stacked triggers ("FREE" + "ACT NOW" + "GUARANTEED").
  • Balance text and media. Keep real copy around your links and images; never send an image-only email.
  • Use branded links. Replace shorteners with your own domain so receivers can see where the link goes.
  • Include the legal footer. A visible unsubscribe link and physical address on every commercial send.
  • Back content with reputation. Clean content can't rescue a bad sending reputation — authenticate your domain and warm up your sending.

Why content is only half of email deliverability

A spam filter doesn't just read your words — it checks whether the sending domain is authenticated with SPF, DKIM, and DMARC records, whether the sending IP address or domain has been blacklisted, and how the recipient's mail server has scored your sender reputation over time. Gmail and Outlook, along with other mailbox providers, weigh subscriber engagement — opens, replies, spam complaints — right alongside content. A cold email with pristine wording can still land in the spam folder if the sending domain has no authentication history; an established sender with a strong reputation can survive language this spam word checker would flag. Clean content lowers your risk. It doesn't guarantee the recipient's inbox.

  • Authenticate your domain. SPF, DKIM, and DMARC prove you are who you claim to be — without them, spam filters treat every message from your domain as unverified.
  • Check your blacklist status. A blacklisted sending IP address or domain overrides otherwise clean content every time.
  • Watch engagement, not just words. Opens, replies, and spam complaints teach mailbox providers whether recipients actually want your email.

Email spam checker FAQ

The highest-risk words cluster around money and urgency: 'free', 'cash', 'guaranteed', 'act now', 'limited time', 'risk-free', '100% free', 'make money', 'no cost', 'winner', and overpromise phrases like 'miracle' or 'this isn't spam'. No single word blocks an email on its own, but stacking several of these — especially in the subject line — raises your spam score. This email spam checker flags each one and groups it by category.

Authenticate your domain with SPF, DKIM, and DMARC, send from a warmed-up reputation, keep a clean list, and write like a human: a clear subject without ALL-CAPS or '!!!', a healthy text-to-link ratio, a working unsubscribe link, and your physical mailing address (required by CAN-SPAM). Content alone won't fix a bad sending reputation, but spammy content will sink a good one.

No. Modern filters weigh sender reputation, authentication, engagement history, and list hygiene far more heavily than individual words. Word choice is one input among many — but it's the one you control instantly, and obvious spam triggers (ALL-CAPS subjects, '$$$', 'act now', no unsubscribe) still tip borderline messages into the spam folder. This tool checks the content signals so you can rule them out.

On this 0–100 risk scale, lower is better: under 30 is low risk (clean content), 30–60 is medium risk (a few triggers worth fixing), and over 60 is high risk (likely to be filtered or junked). The goal is to remove every avoidable content signal so your reputation and authentication can do their job.

It's a deterministic content audit — it checks the same signals filters look at (trigger words, caps ratio, punctuation, link density, CAN-SPAM elements) and runs entirely in your browser, so nothing is uploaded. It cannot see your sender reputation, IP, or authentication, which matter just as much. Treat it as a fast content pass; IGSendMail handles reputation, SPF/DKIM/DMARC, and live spam-placement testing inside the app.

No. A single word like 'free' or 'discount' is everywhere in legitimate marketing and won't block you by itself. Risk is cumulative — it's the combination of many triggers, an ALL-CAPS subject, excessive punctuation, broken links, and a missing unsubscribe that pushes a message over the line. Fix the highest-weighted items first; you don't need a zero score.

Content is one input among several. If your domain lacks SPF, DKIM, and DMARC records, if your sending IP address or domain has landed on a blacklist, or if your list is stale and recipients aren't opening or are marking messages as spam, mailbox providers like Gmail and Outlook will filter clean copy anyway. Sender reputation and authentication carry more weight than word choice — run this spam checker for content, then verify your domain's authentication records separately.

Fix the flagged trigger words and formatting issues first — they're free and instant. Then check what a content checker can't see: whether SPF, DKIM, and DMARC are configured for your sending domain, whether your domain or IP address shows up on a blacklist, and how your list is engaging. IGSendMail's free plan covers up to 2,500 contacts and sets up authentication automatically; paid plans start at $19/month and add real inbox-placement testing and reputation monitoring for larger lists.

Clean copy is only half the battle

IGSendMail pairs spam-safe content with automatic SPF, DKIM, and DMARC, real inbox-placement testing, and reputation monitoring — so your emails actually land.

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