HP-UX Mailing Services Administrator's Guide

Configuring and Administering Sendmail
Modifying the Default Sendmail Configuration File
Chapter 2 57
Loose relay check This option turns off the default behavior of
rechecking all those recipients using the % addressing. For example, if
the recipient address is user%site@othersite, the default behavior
without the loose_relay_check option is that Sendmail will check if any
othersite is an allowed relay host specified in either class R macro or the
access db file. If a site is an allowed relay host, the check_rcpt ruleset
strips @othersite and checks user@site for relaying. Sendmail does not
recheckif this option is set to ON. This option is not required for most
installations.
Promiscuous Relay This option allows your mail server to relay any
received mails. You must be careful before enabling this option.
No Default MSA You can use this option to generate the configuration
file without the DaemonPortOptions option for the Message Submission
Agent (MSA) daemon. If you use this option, the sendmail.cf
configuration file will not contain the following line:
O DaemonPortOptions=Port=587, Name=MSA, M=E
DNS Blackhole List The dnsbl option avoids the possible confusion
between RealtimeBlackhole List and other DNS-based Blacklist
servers, such as ORBS. It takes the name of the Blacklist server and also
an optional rejection message as arguments.
You can include dnsbl multiple times in the sendmail.cf file, thereby
allowing sites to subscribe to multiple Blacklist servers. The Blacklist
server verifies the IP address of the incoming connection and rejects all
the SMTP commands if the address is blacklisted. An error message is
also displayed.
Relay mail from You can use this option to facilitate relaying through
a user machine. The sender name, which is listed as RELAY in the access
map (tagged with From:), can be specified using this option. The domain
portion of the mail sender is also checked when the optional argument
domain is provided.
Delay checks This option delays the anti-spam checks by Sendmail
until it issues the SMTP RCPT command. Mail from certain addresses
that might have been blocked by other anti-spam checks are received. In
these cases, deferred checks are not done.
By using delay_checks, the rulesets check_mail and check_relay are
not called when a client connects or issues a MAIL command, respectively.
Instead, those rulesets are called by the check_rcpt ruleset; they are