Internet Express for Tru64 UNIX Version 6.10 Administration Guide (5900-1418, March 2011)

Note:
Setting this checkbox may allow spam mail to relay through your server if it is not set up
properly.
• Set the Check for Blacklist Recipients in Access Database checkbox when you want to block
incoming mail for certain recipient user names, host names, or IP addresses. For example,
you can block incoming mail addressed to nobody, host example1.domain.name, or
user [e-mail], as specified in the accessdb file. (See Section :
Configuring the Access Database for information on the accessdb file.)
• Set the Allow Unrestricted Relaying checkbox, to accept mail from outside your domain and
send it to another host outside your domain. When this checkbox is set, your site will allow
mail relaying from any site to any site.
• Set the Reject Mail from Server in Realtime Blackhole List checkbox to reject mail from any
server listed in the Realtime Blackhole List. For more information on the Mail Abuse Protection
System (MAPS) and the Realtime Blackhole List, see
http://mail-abuse.org/rbl/
When you are through setting the Configure Relaying options, click on Submit. A success message
confirms that relaying has been configured on your system and that your Sendmail server has been
restarted.
Configuring the Access Database
The Sendmail server uses an access database for the following purposes:
• To reject mail from specific domains and addresses (RHS: REJECT or a specific error message)
• Accept mail even though it might be rejected by subsequent checks (RHS: OK)
• Permit mail to be relayed (RHS: RELAY)
The access database uses e-mail addresses, domain names, and network numbers as keys, and
uses values to indicate how the Sendmail server should handle mail based on these keys. Example 5
shows the syntax of entries in an access database.
Example 5 Sample Access Database for the Sendmail Server
[e-mail] REJECT
cyberspammer.com REJECT
cyberspammer.com 550 We don't accept mail from spammers!
okay.cyberspammer.com OK
[e-mail] DISCARD
206.117.147 REJECT
sendmail.org OK
128.32 RELAY
As shown in Example 5, the Sendmail server handles incoming mail as follows:
• Rejects mail from [e-mail]
• Accepts mail from host okay at cyberspammer.com (but rejects mail from all other hosts
at that domain and returns the specified message)
• Discards mail from [e-mail] using the $#discard mailer
• Rejects mail from any host on the 206.117.147.* network
• Accepts mail from all users at sendmail.org
• Relays messages from the 128.32.*.* network
To create an access database:
Sendmail Server Administration 105