What is the Reply-To header? A Clear Guide

Reply-To sets where replies go, which can differ from the From address. Using a real, monitored Reply-To improves engagement and trust.

Why it matters

Knowing the Reply-To header helps you send mail that lands in the inbox. See the deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI watching list health and deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.