What is “reply-to-all” behavior?
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Reply-to-all sends your message back to everyone who was visibly included in the original email. That means the sender (or whoever's listed in the Reply-To address if they set one) plus everyone in the To and CC fields. BCC recipients are hidden and never exposed, even when someone hits reply-to-all.
From a sender's perspective, this behavior doesn't apply to marketing or transactional email. Your subscribers can't reply-to-all because they're not part of a group conversation. They're receiving individual copies. Reply-to-all only comes into play for personal or business emails where multiple people are genuinely collaborating (think work threads, event planning, group discussions).
And if you're running an email program, the main thing to understand is that reply-to-all is a recipient-side behavior you can't control. What you CAN control is the Reply-To header, which tells mail clients where replies should land. Set that correctly so replies go to a monitored address (your support inbox, not noreply@yourdomain.com), and you're covered. The rest is up to your readers and their mail client.
Want to see how your Reply-To is configured? Check your email headers with our free header analyzer.
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