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https://www.mail-tester.com/

https://unspam.email/

https://kickbox.com/email-spam-tester/

https://www.mailgenius.com/

https://knowledgebase.constantcontact.com/email-digital-marketing/articles/KnowledgeBase/21985-Check-your-spam-score%3Flang%3Den_US

https://www.experte.com/spam-checker

https://mailmeteor.com/spam-checker

https://www.mailreach.co/email-spam-test

https://lemwarm.com/deliverability-test

https://glockapps.com/spam-testing/