DNS: questions about domain name configuration, name server and MX records for email

Description
How do I add a mail/MX record for my domain?
How do I add a new domain to an existing account?
Why won't May First/People Link manage my domain name?
What is a domain name server? What is a registrar?
How do I add an SPF (Sender Policy Framework) record to my account?
How come my domain is not available when I try to create an email address?
How to create a WordPress network handling multiple domains?
How do I configure my domain name to use May First/People Link
How do I configure my domain to use May First/People Link's nameservers if I'm registered with Dotster?
How do I configure my domain's name servers to point to May First/People Link if I'm using Network Solutions?

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