Synopsis
An open SMTP relay is running on this port.

Description
The remote SMTP server is insufficiently protected against relaying.
This means that it allows spammers to use your mail server to send
their mails to the world, thus wasting your network bandwidth.

Solution
Reconfigure your SMTP server so that it cannot be used as a relay
any more.

Risk Factor
High

CVSS Base Score
7.8 (CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C