The remote SMTP server is insufficiently protected against relaying This means that spammers might be able to use your mail server to send their mails to the world.
Improve the configuration of your SMTP server so that your SMTP server cannot be used as a relay any more.
- Multiple Kerio Products Administration Console File Disclosure and Corruption Vulnerability
- Code-Crafters Ability Mail Server IMAP FETCH Request Remote Denial Of Service Vulnerability
- Postfix SMTP Server Cyrus SASL Support Memory Corruption Vulnerability
- Mail relaying
- Microsoft Windows SMTP Server MX Record Denial of Service Vulnerability