Under ISPConfig management > server > settings What is the difference between server name and host name and how does changing either one affect my server? I didn't want to dig into a DNS book to find out, if the answer is complicated, let me know, then I'll dig into the DNS book at Barn3s and Nobl3 This question arises because by default ISPConfig uses your server name as your host name (e.g. server1), and the default MX record becomes "server1.domain.com" but I created an A record "mail" and changed the MX record to mail.domain.com. Am I ignoring something here? Thank You!