Hello,
this button really does only search subject texts, but not message contents.

Example:
http://www.malariacontrol.net/forum_thread.php?id=1012 "all linux jobs failed".

If I search for "failed" of the subject text, it works. If I search for the characteristic error exit code "255" contained in the message text, it does not find the message.

It would be more useful if the message text is also searched. In this example I did not find it although I have the same problem, since it was posted in the "Number crunching" forum. In the Linux forum other exit codes are discussed.

Thanks, Karsten