Ok - I got the bastard. The culprit was some strange jar named geronimo-spec-j2ee-1.4-rc4.jar located in my classpath before j2ee.jar, which contained a complete java mail api. It is obviously buggy or some dummy implementation doing nothing but give one gray hair.
Now I don't have to retire anymore ;-) Cheers, Thomas --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]