What’s the impact of broken HTML on spam filters?
Broken HTML can trigger spam filters because malformed code is associated with spam and phishing. Legitimate senders typically produce well formed HTML through professional tools. Broken code suggests amateur construction or intentional obfuscation.
Rendering issues from broken HTML also damage engagement. Emails that display poorly get deleted or ignored, hurting engagement metrics that influence reputation. Broken layouts frustrate recipients who may complain.
Validate HTML before sending. Email specific validators catch issues standard HTML validators miss. Test across multiple clients since different renderers expose different problems. Fix issues before sending to your full list.
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