org.apache.commons.mail.EmailException: Cannot find valid hostname

[Ed]

I'm using the library email of jakarta to send email, but in the method setHostName("") I don't know what I have to put there, and it returns me this

org.apache.commons.mail.EmailException: Cannot find valid hostname
for mail session.

[Peter]

you have to put your host name
I'll give you an example

Code:

  SimpleEmail email = new SimpleEmail();
  email.setHostName("mail.myserver.com");
  email.addTo("jdoe@somewhere.org", "John Doe");
  email.setFrom("me@apache.org", "Me");
  email.setSubject("Test message");
  email.setMsg("This is a simple test of commons-email");
  email.send();

[Jack]

Go to this page: Commons Email - Examples