Sender Email Best Practices
Use an email address you actively monitor. Customers often reply to order confirmations with questions.
Choose a professional address that matches your domain once you have one (orders@yourstore.com works better than yourname@gmail.com).
Avoid using no-reply addresses. They hurt deliverability and make your brand feel impersonal.
Also, once your sender email is set, you should also authenticate your domain. From Settings > Notifications, click 'Authenticate your domain' and add the CNAME records Shopify provides to your DNS settings. This prevents your sender address from being rewritten to a generic store+123@shopifyemail.com address.
Good to know: Shopify's CNAME records handle SPF automatically. You do not need to add a separate SPF TXT record.