HELO with too long argument crashes sendmail

Hi everybody, I have the following problem. I installed a box with SuSE 7.2, updated all packages und then checked the security of the server with Nessus. The result of the scan is, that Nessus could crash sendmail, because of a HELO command with a long argument. Is there a way to prevent this, or is this a problem of the installed SuSE rpm sendmail-8.11.3-68.rpm ? Thanks for your help Have a nice evening Konrad