如果你认为没有必要设置MAIL服务器，而又要用JAVAMAIL的邮件发送功能，那最好的方式就是用自己的免费邮箱服务器！可这些服务器登陆必须要进行验证，所以需要进行带有身份验证的JAVAMAIL编程！
说明：
1.下载javamail.jar和JAF框架（处理多种格式）
2.用你现有的免费邮箱的邮件服务器（需要身份认证）
3.SendEcard.java 发送mail（带附件）的javabean
4.Email_ca.java 身份认证的javabean
package netcard;
/**
*SendEcard.java
*发送mail的javabean
*/
import java.util.Properties;
import java.util.Date;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class SendEcard {
private String tomail;
private String frommail;
private String subject;
private String content;
private String imagecard;
String smtp="****";//设置邮件服务器
public SendEcard() {
}
public String getTomail() {
return tomail;
}
public void setTomail(String tomail) {
this.tomail = tomail;
}
public String getFrommail() {
return frommail;
}
public void setFrommail(String frommail) {
this.frommail = frommail;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
public String getImagecard() {
return imagecard;
}
public void setImagecard(String imagecard) {
this.imagecard = imagecard;
}
public boolean sendMail(){
try{
Properties p=System.getProperties();
p.put("mail.smtp.host",this.smtp);
p.put("mail.smtp.auth","true"); //设置为须验证的模式
Session session=Session.getDefaultInstance(p,new Email_ca("用户名","密码"));
MimeMessage msg=new MimeMessage(session);
msg.setSentDate(new Date());
InternetAddress from=new InternetAddress(frommail);
msg.setFrom(from);
InternetAddress[] address = {
new InternetAddress(tomail)};
msg.setRecipients(Message.RecipientType.TO, address);
msg.setSubject(this.subject);
msg.setText(this.content);
Multipart mp = new MimeMultipart();
MimeBodyPart mbp=new MimeBodyPart();
FileDataSource fds=new FileDataSource(文件路径);
//得到附件本身并至入BodyPart
mbp.setDataHandler(new DataHandler(fds));
//得到文件名同样至入BodyPart
mbp.setFileName(fds.getName());
mp.addBodyPart(mbp);
msg.setContent(mp);
Transport.send(msg);
return true;
}catch(AddressException addr_e){
System.out.println(addr_e.getMessage());
return false;
}catch(MessagingException msg_e){
System.out.println(msg_e.getMessage());
return false;
}
}
}
package netcard;
/**
*Email_ca.java
*身份认证的javabean
*/
import javax.mail.*;
public class Email_ca extends javax.mail.Authenticator{
private String user=null;
private String pwd=null;
public Email_ca(){
super();
}
public void setUser(String user){
this.user=user;
}
public void setPwd(String pwd){
this.pwd=pwd;
}
public Email_ca(String user,String pwd){
super();
setUser(user);
setPwd(pwd);
}
public PasswordAuthentication getPasswordAuthentication(){
return new PasswordAuthentication(user,pwd);
}
}
至此你就可以利用免费邮箱服务器进行邮件发送！ 
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