Vulnerability in authentication process for SMTP service in Microsoft Windows 2000 allows remote attackers to use incorrect credentials to gain privileges and conduct activities such as mail relaying.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6803
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2001/ms01-037
http://www.securityfocus.com/bid/2988