Reply-To

You want the Reply button to reach the person who filled out the form. You do not want their address pretending to be the sender.

That is what Reply-To is for.

Choose the email field

Open Notifications and select the field that contains the submitter's email address.

<input type="email" name="email" required>

Form Plume keeps the authenticated sender in From and places the submitted address in Reply-To.

Putting the submitter in From would fail SPF and DKIM checks, because Form Plume, not the submitter, is the authenticated sender, so mailbox providers would flag or reject the message. Reply-To sidesteps that: your reply is addressed to the submitter, but the message you received still passes authentication. In your inbox you see the notification from Form Plume, and hitting Reply drops the submitter's address into the To field automatically.

If the value is missing or invalid, Form Plume leaves Reply-To out. The notification still arrives safely. Invalid here means an empty value, a malformed address, or a field that does not hold an email at all.