An email header naming where replies should go when it differs from the visible “From” (common for on-behalf-of senders). Ticketing should route to it.
Most mail just uses the From address for both display and replies. Reply-To exists for the cases where those should differ: a message is sent from one address but answers belong somewhere else. When present, a well-behaved mail client directs the reply to Reply-To instead of From.
Why it matters
Support mail is frequently sent on behalf of a shared address or a person, so the right destination for a reply isn’t always the From. If a system ignores Reply-To and answers the From, the response can land in an unmonitored mailbox and the thread dead-ends — the customer thinks they replied, but no one is reading that address. Honoring Reply-To keeps the conversation flowing to whoever is meant to receive it, which matters most in automated or on-behalf-of sends where the visible From is a no-reply or a sending service.
How it works
- From — who the message appears to be from; what the recipient sees.
- Reply-To — where replies should go when that differs from From; optional, but authoritative when set.
- Return-Path — a separate header for bounce handling, not for human replies. See Return-Path.
A concrete example
An e-commerce store sends order updates from orders@ but wants customer questions to reach the support queue. Setting Reply-To to the support address means a customer who hits “reply” lands in the right place — and the help desk threads it into the existing ticket rather than opening a stray one. Without it, those replies would pile up in the orders mailbox where no agent is watching, and the store would look unresponsive through no fault of the team.
How Cherryrise handles it
Naive help desks reply to the From and dead-end the conversation; Cherryrise routes to Reply-To so the customer reaches the real person. That sits alongside its deliverability setup, where mail is signed as your own domain via BYODKIM. See Reply-To vs From for the full breakdown.