Free Deliverability Checker
FreeFree deliverability checker — analyze your emails for spam triggers, authentication issues, and deliverability problems. Fix inbox placement. 100% free.
Why Are My Emails Going to Spam?
Email deliverability is determined by thousands of factors, but they generally fall into three categories: authentication, reputation, and content.
- Authentication Failures: If your domain lacks valid SPF, DKIM, and DMARC records, inbox providers cannot verify your identity and will route your emails to spam to protect users.
- Poor Sender Reputation: Sending emails to invalid addresses (high bounce rate) or receiving too many spam complaints will destroy your IP and domain reputation.
- Content Issues: Using aggressive sales language, broken HTML, misleading subject lines, or linking to blocklisted domains can trigger spam filters.
How to Improve Email Deliverability
Improving deliverability requires a holistic approach. First, ensure your technical foundation (SPF/DKIM/DMARC, rDNS) is perfect. Second, implement a double opt-in process to ensure your subscribers actually want your emails. Third, regularly clean your list using an email validator to remove inactive or bouncing addresses. Finally, monitor your engagement metrics—if users aren't opening or clicking, stop sending to them.
Frequently Asked Questions
What does the Deliverability Checker tool check?
The Deliverability Checker tool analyzes your email content, domain configuration, and sending infrastructure for factors that affect whether emails reach the inbox or land in spam. It checks against rules used by major spam filters and email providers including Gmail, Outlook, and Yahoo. The tool identifies specific issues — such as missing authentication, spam trigger words, poor text-to-image ratio, or missing unsubscribe links — and explains how to fix them.
What are the most common causes of emails going to spam?
The most common causes of emails landing in spam are: (1) Missing or failing SPF, DKIM, or DMARC authentication. (2) Sending from a new IP or domain without a warm-up period. (3) High bounce rates or spam complaint rates (above 0.1% triggers filters). (4) Spam trigger words in subject lines or body. (5) No unsubscribe link in bulk email. (6) Poor text-to-image ratio (image-heavy emails are suspect). (7) Domain or IP on blacklists. Fix these issues systematically using our free deliverability tools.
What is a good email spam score?
Most spam filter scoring systems (including SpamAssassin, which our Spam Score Checker is based on) consider a score below 2.0 to be acceptable. Scores between 2.0 and 5.0 indicate potential issues that should be investigated. Scores above 5.0 significantly increase the likelihood of spam classification. Common score contributors include missing authentication records, spam trigger words, all-image emails, shortened URLs, and excessive punctuation in subject lines.
How do I improve my email inbox placement rate?
To improve inbox placement: (1) Set up SPF, DKIM, and DMARC correctly. (2) Warm up new IPs gradually — start with small volumes and increase over weeks. (3) Keep bounce rates below 2% and spam complaint rates below 0.1%. (4) Send only to engaged subscribers — segment and suppress inactive users. (5) Use double opt-in to ensure valid, consenting recipients. (6) Include a working unsubscribe link. (7) Monitor your sender reputation and blacklist status regularly.