This script is Copyright (C) 2002-2017 Tenable Network Security, Inc.
An open SMTP relay may be running on the remote host.
Nessus has detected that the remote SMTP server allows relaying for
users which were identified by 'POP before SMTP'. The access control
mechanism is based on the POP server logs. However, it is possible to
poison these logs, which means that any spammer could be using your
mail server to send their emails to the world, thus flooding your
network bandwidth and possibly getting your mail server blacklisted.
Note that for some SMTP servers, such as Postfix, this plugin will
display a false positive.
See also :
Disable poprelayd or upgrade it.
Risk factor :
Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 4.3
Public Exploit Available : true