mailing_list.go
func (dom *Domain) MailingList(name string) *MailingList {
	return &MailingList{Domain: dom, Name: name}
}
func (dom *Domain) MailingList(name string) *MailingList {
	return &MailingList{Domain: dom, Name: name}
}
// MailingList creates a MailingList type from a domain, with the given name