Improve your email deliverability by checking your email content with our free spam checker tool.
An email spam checker scans the content of your email before you send it. Paste your subject and body, and Mailwarm highlights spam trigger words, risky phrasing and formatting issues that push emails toward the spam folder. You get a cleaned-up version in one click. Content is one factor among several: sender reputation and engagement matter even more, which is why the checker works best together with warmup.
Instantly scan your email for spam trigger words, risky phrasing, and formatting patterns that may activate spam filters.
Receive AI-powered suggestions to rewrite spam-triggering phrases while keeping your message clear and natural.
Reduce the risk of landing in spam folders and improve email deliverability for cold emails, newsletters, and campaigns.
Advanced spam detection in three simple steps.
Our spam checker scans your email against common spam filter patterns used by Gmail, Outlook, and other major providers. It detects spam trigger words, risky formatting, and suspicious language patterns that may impact deliverability and increase your spam score.
Problematic phrases are highlighted directly in your email. You can instantly see which words increase spam risk and why they may trigger spam filters.
Receive a cleaner version of your email with reduced spam signals while preserving the original meaning and tone of your message.
Protect your sender reputation and maximize email deliverability.
Spam filters analyze every message for suspicious patterns. Words like "free," "urgent," or excessive capitalization can trigger filters. A spam checker helps detect these signals before sending.
When emails repeatedly land in spam, mailbox providers lower your sender reputation. Checking emails before sending helps maintain a strong sending reputation over time.
Better inbox placement means higher open rates, more clicks, and better ROI from your email campaigns.
By seeing which phrases trigger spam filters, marketers naturally improve their email copywriting and deliverability strategy.
Spam filters weigh words differently depending on context. These are the categories that trigger the most flags: urgency and pressure (act now, last chance), money and offers (free, guaranteed income, no fees), health claims, shady formatting (ALL CAPS, excessive punctuation), and deceptive phrasing (this is not spam). Check your draft against each category, or paste it in the tool above and let it do the work.
Act now, last chance, urgent, don't miss out. Artificial deadlines are one of the strongest spam signals.
Free, guaranteed income, no fees, risk free. Financial promises attract heavy filtering, especially on cold sends.
Miracle cure, lose weight fast, clinically proven. Health language is aggressively filtered across every major provider.
ALL CAPS, excessive punctuation, mismatched fonts and colors. Formatting counts as content to a spam filter.
This is not spam, you have been selected, as seen on. Phrases that pre-empt suspicion tend to create it.
One flagged word rarely sinks an email. Density, sender reputation and engagement decide the outcome together.
Learn more about spam detection and email deliverability
Comprehensive list of spam trigger words to avoid in your email campaigns.
Understand the difference between spam triggers and promotional language.
Learn about fake Gmail accounts, spam detection methods, and how to protect your email reputation.
Enhance your email workflow with our free tools
Everything you need to know about the Mailwarm Spam Checker.
Stop losing opportunities to spam folders. Boost your sender reputation and watch your outreach thrive.
