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Analyze email content for spam triggers and improve deliverability. Get actionable recommendations to avoid spam filters and reach the inbox.
Spam filters use complex algorithms to analyze email content, sender reputation, and user behavior. Understanding these systems helps you create content that reaches the inbox consistently.
Excessive capitalization
Using ALL CAPS or too many exclamation marks looks unprofessional.
Spam keywords
Terms like "free", "guarantee", "winner" trigger filters.
Poor formatting
Excessive punctuation, colors, or hidden text raises red flags.
Suspicious links
URL shorteners and IP addresses instead of domains.
Write naturally
Use proper grammar, spelling, and conversational tone.
Provide value
Focus on helpful content rather than pure sales messaging.
Test regularly
Check content before sending to large lists or campaigns.
Build reputation
Consistent sending patterns and engagement improve deliverability.
Our spam checker analyzes your email subject line and body content against known spam triggers, keyword lists, and formatting rules used by major email providers to identify spam.
A lower spam score is better. Ideally, you want a score of 0. Scores below 2.5 are generally considered safe, while scores above 5.0 are likely to be marked as spam.
Yes, you can paste your HTML code into the tool to analyze both the content and the HTML structure for potential issues.
Yes, this spam checker is completely free to use for analyzing your email content.
InboxKit helps you avoid spam filters and reach the inbox consistently
