There are basics in configurations that "most" will want to have setup. I realize SM has a diagnostics but SM could go further in helping an admin make sure mail is setup. I recently moved SM to a new server and somehow I ended up with no bindings on the default ports for every service. I have SSL and TLS all setup but I missed that all the non SSL/TLS ports had no bindings. SM could easily alert an admin to this, it would be an alert, suggestion, one time thing so then when the admin dismisses it then it won't nag them. But this is a condition that could have been brought to my attention by a smart system. "Alert: SMTP, POP3, LDAP are missing bindings". With some careful thought of what most admins setup SM could be a lot smarter in helping to ensure reliable email deliverability. I went days before I figured this out.