Support custom email headers via sendRawEmail - #63
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The sendEmail API doesn't support custom headers like List-Unsubscribe. When non-standard headers are passed to wp_mail(), automatically switch to sendRawEmail which preserves them in the raw MIME message. Standard emails without custom headers continue using sendEmail as before. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Any reason not to always use sendRawEmail? Seems like sendEmail might be more of a convenience abstraction anyway. |
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Yeah mostly I was being conservative not to break anything :D |
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Summary
wp_mail()is called with non-standard headers (e.g.List-Unsubscribe,List-Unsubscribe-Post,X-*), automatically switch fromsendEmailtosendRawEmailwhich preserves them in the raw MIME messagesendEmailas before — no change in behavior for existing usageTest plan
wp_mail()without custom headers — should usesendEmailas beforeList-Unsubscribeheader — should usesendRawEmailand header should appear in "View Original" in Gmail🤖 Generated with Claude Code