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

following line in mailfile to forward all mail addressed to the owner to a given
machine or person:
Forward to <person>
This is used especially for forwarding mail to a given machine in a multiple-machine
environment. The Forward option requires read-write group permission and mail
group ID in the mailfile.
Unlike mail, you can use rmail only to send messages. UUCP uses rmail as a security
precaution.
For more information on mail and rmail, type man 1M mail at the HP-UX prompt.
The Sendmail Utility
Sendmail acts as a post office, to which all messages can be submitted for routing.
Sendmail interprets both Internet (that is, user @domain) and UUCP (that is, host
!user) styles of addressing. The Sendmail configuration file controls how the addresses
are interpreted. Sendmail can rewrite message addresses to conform to standards on
many common target networks. Sendmail 8.13.3 for HP-UX 11i v3 is an HP
implementation of publicly available Sendmail 8.13.3. HP provides support for the
features documented in this chapter and in the sendmail (1M) manpage.
When Sendmail starts in the daemon mode, it listens both on the normal port 25 for
incoming SMTP connections and on port 587 for the local submission of mail messages.
The latter is a Mail Submission Agent (MSA) (RFC 2476) and requires that Mail User
Agents (MUAs) be explicitly coded to use port 587 for local submission of mail directly
to the Sendmail daemon.
When Sendmail is executed independently or invoked from an MUA to process the
locally submitted mail, it acts as an Mail Submission Program (MSP). MSP accepts and
processes the submitted mail messages as a non-superuser and queues them separately.
After processing, MSP delivers the submitted mail messages to the Sendmail MTA
daemon, using the SMTP protocol through port 25. The /etc/mail/submit.cf file
assumes that the Sendmail MTA daemon is running on the local host. The
/etc/mail/sendmail.cf file is the default configuration file for the Sendmail MTA
daemon. The /etc/mail/submit.cf file is the default configuration file for the
Sendmail MSP daemon. You can use the
/usr/newconfig/etc/mail/cf/cf/gen_cf script to generate the
/etc/mail/sendmail.cf and /etc/mail/submit.cf files. For more information
on the /usr/newconfig/etc/mail/cf/cf/gen_cf script, see “The
/usr/newconfig/etc/mail/cf/cf/gen_cf Script” (page 52).
When the Sendmail MTA daemon starts, an additional Sendmail MSP queue-processing
daemon also starts by default. The MSP queue daemon does not listen on any socket.
It only periodically scans the MSP mail queues for any mail messages accepted by MSP
that is not forwarded to the Sendmail MTA daemon.
22 Mailing Services Overview