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The javax.mail.Address
class is very simple. It’s an abstract class that exists mainly to be
subclassed by other, protocol-specific address classes:
public abstract class Address extends Object
There are two of these subclasses in the standard JavaMail API:
InternetAddress for SMTP email and
NewsAddress for Usenet
newsgroups:
public class InternetAddress extends Address public class NewsAddress extends Address
Providers of other mail protocols would also subclass Address with classes that represented their
style of address.