I've registered a domain (xyz.com) and transferred the name servers to my hosting company Rackspace.
I want to be able to create mail addresses firstname.lastname@example.org, and email@example.com.
I renamed the hostname to mail.xyz.com.
Which 'A' records should I create, mail.xyz.com, xyz.com, mysub.xyz.com, mail.mysub.xyz.com? or all?
ditto MX records?