Spam Check
A free JSON API to check your email messages' spam scores
竞品与替代品
Email Spam Words API
Free API to list all email spam words in different languages
Email Validator!
Free JSON API that gives you a simple way to validate emails
Inbox Grader by Freshworks
Free metrics 📈 for your business and team email ✉️
Warmup Inbox
Free email spam checker & inbox placement tester
Email Health Report
Analyse your emails and get actionable insights for free