Help! My Email Is Broken: Eight Common Errors + Fixes
Briefly

Unexpected issues can damage email reputation and result in emails being sent to spam folders. Safeguards, monitoring, and testing are essential to prevent these problems.
Prepare for email client variations, inbox, app, and browser changes. Test emails for potential issues and use tools like Litmus' code analysis to identify unsupported HTML or CSS properties.
Read at Litmus
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