javax.mail: 501 Syntactically invalid HELO argument(s)

These days I ran into trouble when setting up out java-baes CMS on a fresh installed debian.

Almost everything worked fine except the newsletter tool. Looking at the catalina.log I found the following stacktrace:

javax.mail.MessagingException: 501 Syntactically invalid HELO argument(s)
      at com.sun.mail.smtp.SMTPTransport.issueCommand(SMTPTransport.java:1308)
      at com.sun.mail.smtp.SMTPTransport.helo(SMTPTransport.java:785)
      at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:327)
      at javax.mail.Service.connect(Service.java:236)
      at javax.mail.Service.connect(Service.java:137)
      at javax.mail.Service.connect(Service.java:86)

A googlesearch pointed me to the sun developer network. Assuming that there are config problems I decieded not to introduce the config parameter mail.smtp.localhost (I never needed to use it before).

When looking at the mentioned javadocs I found

Okay, following that hint I tried a quick coded test program:

import java.net.*;
public class test {
   public static void main ( String [] args ) {
     try {
       System.err.println( InetAddress.getLocalHost().getHostName() );
     } catch ( Exception e ) {
       e.printStackTrace();
     }
   }
}

When running it: boing!:

(I replaced my domain name).)

formel5@gruender-mv:~/domains/gmv$ java test
java.net.UnknownHostException: mydomain: mydomain
        at java.net.InetAddress.getLocalHost(InetAddress.java:1191)
        at test.main(test.java:5)

Okay. need to fix my /etc/host: added mydomain (And talk to my admin )

formel5@gruender-mv:~/domains/gmv$ java test
mydomain

Fine. Now I restarted my newsletter webapp without any problems