support for replyto header

email.go

@@ -154,6 +154,7 @@ func sendResendEmail(to, _, _ []string, from, subject, body string, attachments
 
 	request := &resend.SendEmailRequest{
 		From:        from,
+		ReplyTo:     replyTo,
 		To:          to,
 		Subject:     subject,
 		Cc:          cc,

main.go

@@ -27,6 +27,9 @@ const ResendAPIKey = "RESEND_API_KEY" //nolint:gosec
 // PopFrom is the environment variable that sets the default "from" address.
 const PopFrom = "POP_FROM"
 
+// PopReplyTo is the environment variable that sets the default reply-to address.
+const PopReplyTo = "POP_REPLY_TO"
+
 // PopSignature is the environment variable that sets the default signature.
 const PopSignature = "POP_SIGNATURE"
 
@@ -51,6 +54,7 @@ const PopSMTPInsecureSkipVerify = "POP_SMTP_INSECURE_SKIP_VERIFY"
 
 var (
 	from                   string
+	replyTo                string
 	to                     []string
 	cc                     []string
 	bcc                    []string
@@ -137,6 +141,7 @@ var rootCmd = &cobra.Command{
 
 		p := tea.NewProgram(NewModel(resend.SendEmailRequest{
 			From:        from,
+			ReplyTo:     replyTo,
 			To:          to,
 			Bcc:         bcc,
 			Cc:          cc,
@@ -203,6 +208,8 @@ func init() {
 	rootCmd.Flags().StringVarP(&body, "body", "b", "", "Email's contents")
 	envFrom := os.Getenv(PopFrom)
 	rootCmd.Flags().StringVarP(&from, "from", "f", envFrom, "Email's sender"+commentStyle.Render("($"+PopFrom+")"))
+	envReplyTo := os.Getenv(PopReplyTo)
+	rootCmd.Flags().StringVarP(&replyTo, "reply-to", "R", envReplyTo, "Email's reply-to address"+commentStyle.Render("($"+PopReplyTo+")"))
 	rootCmd.Flags().StringVarP(&subject, "subject", "s", "", "Email's subject")
 	rootCmd.Flags().BoolVar(&preview, "preview", false, "Whether to preview the email before sending")
 	envUnsafe := os.Getenv(PopUnsafeHTML) == "true"

model.go

@@ -58,6 +58,8 @@ type Model struct {
 
 	// From represents the sender's email address.
 	From textinput.Model
+	// ReplyTo represents the reply-to email address.
+	ReplyTo textinput.Model
 	// To represents the recipient's email address.
 	// This can be a comma-separated list of addresses.
 	To textinput.Model
@@ -96,6 +98,16 @@ func NewModel(defaults resend.SendEmailRequest, deliveryMethod DeliveryMethod) M
 	from.PlaceholderStyle = placeholderStyle
 	from.SetValue(defaults.From)
 
+	replyTo := textinput.New()
+	replyTo.Prompt = "Reply-To "
+	replyTo.Placeholder = "[email protected]"
+	replyTo.PromptStyle = labelStyle.Copy()
+	replyTo.PromptStyle = labelStyle
+	replyTo.TextStyle = textStyle
+	replyTo.Cursor.Style = cursorStyle
+	replyTo.PlaceholderStyle = placeholderStyle
+	replyTo.SetValue(defaults.ReplyTo)
+
 	to := textinput.New()
 	to.Prompt = "To "
 	to.PromptStyle = labelStyle.Copy()
@@ -192,6 +204,7 @@ func NewModel(defaults resend.SendEmailRequest, deliveryMethod DeliveryMethod) M
 	m := Model{
 		state:          state,
 		From:           from,
+		ReplyTo:        replyTo,
 		To:             to,
 		showCc:         len(cc.Value()) > 0 || len(bcc.Value()) > 0,
 		Cc:             cc,
@@ -440,6 +453,8 @@ func (m Model) View() string {
 
 	s.WriteString(m.From.View())
 	s.WriteString("\n")
+	s.WriteString(m.ReplyTo.View())
+	s.WriteString("\n")
 	s.WriteString(m.To.View())
 	s.WriteString("\n")
 	if m.showCc {