How to test that the mail server is alive with Java?

问题

Is there a way with JavaMail API to check that the mail server used is alive ? If not, how do to it with Java code ?

Thanks by advance for your help.

回答1:

If you've got a reference to a Session instance, you could do the following:

Session s = //a JavaMail session I got from somewhere
boolean isConnected = s.getTransport("smtp").isConnected();

If the mail client is connected to the appropriate SMTP server, it usually means it's alive.

回答2:

From the JavaMail API, you could try sending an email and seeing if it was sent successfully.

From a connectivity standpoint, you could just ping it:

  InetAddress host = InetAddress.getByName("mailserver");
  System.out.println("host.isReachable(1000) = " + host.isReachable(1000));

来源：https://stackoverflow.com/questions/9294968/how-to-test-that-the-mail-server-is-alive-with-java