HP-UX Mailing Services Administrator's Guide (B2355-91064)

Accept unqualified senders
This option allows Sendmail to accept all those MAIL FROM: parameters where the
mail address of the sender does not include a domain name. Normally, MAIL FROM:
commands in the SMTP session are refused if the connection is a network and the
sender address does not include a domain name.
Realtime Blackhole List
Setting this option, turns ON the rejection of hosts found in the Realtime Blackhole
List. The default list is maintained on the server $def_rbl. This option has now been
deprecated.
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.
Modifying the Default Sendmail Configuration File 57