SMTP Feature needed

It is important to set an SMTP for Whitelabel so users can use their own domain emails instead of tying it to Mailgun to avoid emails such as email@subdomain.mydomain.com instead of email@mydomain.com. With SMTP the user can then set things like Sendgrid and other SMTP services easily without having to rely on sasstics own mailgun. For white-label this would be imperative users can set their own domain emails.