SpamAssassin Rule: RCVD_IN_MAPS_DUL
Standard description: Relay in RBL, www.mail-abuse.org/rbl/
Explanation
The message was received via a relay listed in the DNSBL dialups.mail-abuse.org.
The criteria for listing is that the relay address appears to be dynamically allocated, indicating that it is probably a customers computer and not a properly configured mail relay
Since 2005, mail-abuse.org is operated by Trend Micro
Further Info
The default scores for this rule can be found in the online list of tests.