Support for replyTo in the GadgetMailer

await emails.sendMail({
    to: supportEmail,
    replyTo: customerEmail,
    subject: `Unanswered question on ${shopName}`,
    // Pass your custom template
    // The default template is an EJS string
    html: DefaultEmailTemplates.renderEmailTemplate(CustomTemplate, {
      shopName: shopName,
      transcript: formattedTranscript,
    }),
  });