Symantec Vulnerability Research Security Advisory SYMSA-2006-006 – Lotus Domino SMTP Based Denial of Service: There exists a Denial-of-Service condition within NROUTER when parsing meeting requests. The result of which is that no external or internal mail will be delivered during the processing of the malformed message.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/47848/SYMSA-2006-006.txt
Source: https://packetstormsecurity.com/files/47848/SYMSA-2006-006.txt.html