System information
136 Chapter 9 Customizing Services
To relay outgoing mail through another server:
1 In the Mail pane of Server Preferences, select “Relay outgoing mail through ISP.”
If this option is already selected, click the Edit button next to it.
A dialog appears for entering the relay server connection details.
2 Enter the relay server’s DNS name or IP address supplied by your ISP or organization.
3 If your ISP or organization also requires your server to authenticate before sending
mail, select “Enable SMTP relay authentication” and enter the user name and password
from your ISP or organization.
Rejecting Mail from Blacklisted Senders
Your server’s mail service can reject mail from other mail servers that are blacklisted as
open relays by a DNS blacklist (DNSBL) server. Your mail service uses the DNSBL server
zen.spamhaus.org, which is operated by The Spamhaus Project (www.spamhaus.org).
You can specify a dierent DNSBL server. DNSBL servers are also known as Real-time
Blacklist (RBL) servers or black-hole servers.
Blocking unsolicited mail from blacklisted senders might not be completely accurate.
Sometimes it prevents receiving valid mail from mail servers that are congured
incorrectly.
To specify the DNSBL server you want mail service to use:
In the Mail pane of Server Preferences, select “Reject email from blacklisted senders,” m
click the Edit button next to this option, and then enter the DNSBL server’s address.