Just Java™ 2

Sending Email by Java

As our next example, let's write a Java program to send some email. Email is sent by socketed communication with port 25 on a computer system. All we are going to do is open a socket connected to port 25 on some system that is running a mail server and speak “mail protocol” to the sendmail demon at the other end. If we speak the mail protocol correctly, it will listen to what we say, and send the email for us.

The following requires an Internet standard mail (SMTP) program running on the server. If your server has some non-standard proprietary mail program on it, you're out of luck. If your ISP uses a different port for mail (mine uses port 5190) use that instead. You can check which program you have by telnetting to ...