Blacklists

Many organizations, such as Mail Abuse Prevention System (MAPS*) and SpamCop*, provide lists of IP addresses that are known to be open relay hosts or spam hosts. If you want to use free blacklist services such as these, or if you subscribe to fee-based services, you can use this property page to define the blacklist addresses for these services. The Internet Agent then uses the defined services to ensure that no messages are received from blacklisted hosts.

If you want to block specific hosts yourself rather than use a blacklist (in other words, create your own blacklist), you can configure a class of service that prevents messages from those hosts. You do this on the Internet Agent object's Access Control Settings page by editing the desired class of service to add the hosts to the Prevent Messages From exception list on the SMTP Incoming tab. For example, if you wanted to block all messages from badhost.com, you could edit the default class of service to add badhost.com to the list of prevented hosts.

You can also use the Allow Messages From exception list on the SMTP Incoming tab to override any blacklisted hosts. For example, if goodhost.com has been added to a blacklist but you still want to receive messages from that host, you could edit the default class of service to add goodhost.com to the list of allowed hosts.

Blacklist Addresses
The Blacklist Addresses list displays the addresses of all blacklists that the Internet Agent will check when it receives a message from another SMTP host. The Internet Agent checks the first blacklist and continues checking lists until the sending SMTP host's IP address is found or all lists have been checked. If the sending SMTP host's IP address is included on any of the blacklists, the message is rejected. If you have the Internet Agent's logging level set to Verbose, the log file includes information about the rejected message and the referring blacklist.

This list corresponds with the Internet Agent's /rbl switch.

Add
Click Add to add a new blacklist address. The following list provides the names, Web sites, and blacklist URLs for several services that were free at the time of this release:

Service	Site	Blacklist URL
Mail Abuse Prevention System (MAPS)	www.mail-abuse.org	blackholes.mail-abuse.org
SpamCop	www.spamcop.net	bl.spamcop.net

Edit
To modify a blacklist address, select the address, then click Edit.

Delete
To remove a blacklist address from the list, select the address, then click Edit.

Up-Arrow, Down-Arrow
The Internet Agent checks the blacklists in the order they are listed, from top to bottom. Use the up-arrow and down-arrow buttons to arrange the blacklists in the order you want them checked.

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