Do email headers matter to inboxing?
Yes. Email headers matter to inboxing. Headers contain authentication results, routing information, and sender identification that filters evaluate. Malformed or suspicious headers trigger scrutiny.
Key headers include From, authentication results (SPF, DKIM, DMARC), routing headers showing path, and various technical fields. Filters analyze these as part of overall message evaluation.
Ensure your sending produces proper headers. ESP configuration affects header generation. Test that authentication headers show passing results and other headers are properly formatted.
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