here is the situation . i have a dns server registed it is jmugs981.org . and i set up it in ispconfig so now ispconfig can create dns records ,and they are effective. so if a user like to use my subdomian . it is normally . i understood. but if a user who has a domain name ,such as www.example.com(which means that he has the other name server ,it will support the dns query , and he do add ,del ,edit a record or cname or .... in that server ) i crate a email user for example web5_user2 and passwd password can the user use the mail firstname.lastname@example.org ? when i create the website . should i enable the create dns and the dns-mx ?